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Dear All,
I have a Sony Xperia U (European).
I used the update service to first competely update the phone to stock 4.0.4 (6.1.1.B.1.54)
Then I did the procedure to get the key and unlock the bootloader. That all worked fine.
Then I tried to do the root of the backup and restore. But I understand that doesn't work anymore.
So I found the following:
1. Flash ics 6.1.1.b.1.10 Kernel
2. Root with flashtools
3. Flash ics 6.1.1.b.1.54 Kernel
I have the drivers installed from the Flashtool folder. And the fastboot mode and flashboot drivers work in order.
After flashing the older kernel with the Flashtool the phone reboots and after that I when it boots everything become distorted and unresponsive.
I can see part of the OS and try to touch and 'something' will happen. But it doesn't seem to be normal.
The only thing I can do then is use the flashtool to relock the bootloader and then the update service to reflash back to stock again.
I have first search the whole subforum and read everything. But I can't seem to fine something about this.
Am I missing something?
The screen does go dark and awful using the older kernel. Just let it take its time to load and u can just about make out the screen to use the root tool. Although.... If you're bootloader unlocked just fastboot an auto rooting kernel
Sent from my Jellybean Xperia S
Ben36 said:
The screen does go dark and awful using the older kernel. Just let it take its time to load and u can just about make out the screen to use the root tool. Although.... If you're bootloader unlocked just fastboot an auto rooting kernel
Sent from my Jellybean Xperia S
Click to expand...
Click to collapse
Ah OK. So that is supposed to be like that. Thanks for the tip, I will try an auto rooting kernel, and post my results here.
Try - http://forum.xda-developers.com/showthread.php?p=35725772
Sent from my Jellybean Xperia S
Phone Died?
Well for some reason the phone doesn't turn on anymore.
I thought I 'overdrained' it, so I put it all night long to charge it. But this morning still the same and it won't turn on.
The small red led just right of the camera lits up when I connect the charger so he sees something but what?
Cannot get in flash or fastboot mode. However sometimes I see the phone out of itself turn on the illumination bar (green) for just a few seconds.
The phone itself does nothing. But I'm thinking of a brick, unless someone else has some ideas?
Take these steps...may help
thatrunks said:
Well for some reason the phone doesn't turn on anymore.
I thought I 'overdrained' it, so I put it all night long to charge it. But this morning still the same and it won't turn on.
The small red led just right of the camera lits up when I connect the charger so he sees something but what?
Cannot get in flash or fastboot mode. However sometimes I see the phone out of itself turn on the illumination bar (green) for just a few seconds.
The phone itself does nothing. But I'm thinking of a brick, unless someone else has some ideas?
Click to expand...
Click to collapse
Try this...
1. Take out the battery and sim and leave it for minutes...then take in the sim and then battery.
2. connect the phone to a charger and wait for minimum 25 seconds and see what happenes...if some positive response you get...leave it charging as it is for some time minimum half hour.
[Before doing 3rd step download latest stock firmware 6.1.1.C.1.0 for your phone.(Please be sure for thats a stock original firmware)] - Search It-> [Stock ROM] Firmware 6.1.1.C.1.0 FTF ICS Xperia U - T-Mobile (Croatia)
3. connect your phone with the pc in flashmode and flash this firmware.
4. After flashing Restart the phone and wait for the setup and then you get then the power off button on your mobile screen, power off it.
5. Download TheBrains Recovery - Search it [Its a kernel having CWM Recovery Prerooted]
6. Now connect your phone in fastboot mode [While connecting your phone to pc press and hold Volume Up button]
7. Select a kernel to flash [Kernel that you downloaded just now]
8. After flashing unplug usb and restart your phone, when Sony logo appears and phone vibrates press Volume Up button again and again then you will come to CWM Recovery Menu.
9. Then from recovery wipe cache. and wipe dalvich cache [In advance option]
10. Now restart your phone and wait...and leave it for 5 mins.
11. Now your phone is updated and prerooted safely and smoothly... and yes ready for installing any stock based ROM or Custom ROM[which are based on latest C.1.0 firmware].
Mohitash said:
Try this...
1. Take out the battery and sim and leave it for minutes...then take in the sim and then battery.
2. connect the phone to a charger and wait for minimum 25 seconds and see what happenes...if some positive response you get...leave it charging as it is for some time minimum half hour.
[Before doing 3rd step download latest stock firmware 6.1.1.C.1.0 for your phone.(Please be sure for thats a stock original firmware)] - Search It-> [Stock ROM] Firmware 6.1.1.C.1.0 FTF ICS Xperia U - T-Mobile (Croatia)
3. connect your phone with the pc in flashmode and flash this firmware.
4. After flashing Restart the phone and wait for the setup and then you get then the power off button on your mobile screen, power off it.
5. Download TheBrains Recovery - Search it [Its a kernel having CWM Recovery Prerooted]
6. Now connect your phone in fastboot mode [While connecting your phone to pc press and hold Volume Up button]
7. Select a kernel to flash [Kernel that you downloaded just now]
8. After flashing unplug usb and restart your phone, when Sony logo appears and phone vibrates press Volume Up button again and again then you will come to CWM Recovery Menu.
9. Then from recovery wipe cache. and wipe dalvich cache [In advance option]
10. Now restart your phone and wait...and leave it for 5 mins.
11. Now your phone is updated and prerooted safely and smoothly... and yes ready for installing any stock based ROM or Custom ROM[which are based on latest C.1.0 firmware].
Click to expand...
Click to collapse
Thanks for your input.
Unfortunately I cannot do step 3.
He just will not go into flashmode, tried different cables but that doesn't work. He won't go into fastboot either.
I've taken out the battery and sim for 5 days. Just to be sure . But I'm thinking it's bricked. This has never happened to me before.
I have unlocked and flashed many phones (mostly HTC's and Samsungs), but this is a first with Sony, hmm and first time a brick.
thatrunks said:
Dear All,
I have a Sony Xperia U (European).
I used the update service to first competely update the phone to stock 4.0.4 (6.1.1.B.1.54)
Then I did the procedure to get the key and unlock the bootloader. That all worked fine.
Then I tried to do the root of the backup and restore. But I understand that doesn't work anymore.
So I found the following:
1. Flash ics 6.1.1.b.1.10 Kernel
2. Root with flashtools
3. Flash ics 6.1.1.b.1.54 Kernel
I have the drivers installed from the Flashtool folder. And the fastboot mode and flashboot drivers work in order.
After flashing the older kernel with the Flashtool the phone reboots and after that I when it boots everything become distorted and unresponsive.
I can see part of the OS and try to touch and 'something' will happen. But it doesn't seem to be normal.
The only thing I can do then is use the flashtool to relock the bootloader and then the update service to reflash back to stock again.
I have first search the whole subforum and read everything. But I can't seem to fine something about this.
Am I missing something?
Click to expand...
Click to collapse
I had the same problem while rooting my phone too.
Follow These:
1.Install the latest PC Companion on your computer. It auto updates if you have it installed on your computer.
2.Download the kernels 6.1.b.1.10 and 6.1.b.1.54 and Flashtool. Make sure you have usb debugging on even before you flash the kernels.
3. With the help of flashtool flash your phone on .10 kernel reboot. The launcher might turn black and become unresponsive so enable usb debugging before flashing itself.
4. Start your phone after flashing .10 and connect to your computer.
5.Start Bin4ry v17 or v18. It a cmd file developed by a dev on xda. Just search for it. Rooting via flashtool wont work. Use Bin4ry
6. Press 1 and follow the steps. after the phone finishes rooting it it'll restart and confirm it.
7. Switch off your phone and flash 54 kernel
8. Pretty sure it'll work!
Worked for me! Hope it helped
unbrick my Sony Ericsson xperia play whilst trying to update the software to android 4.1.2 I've killed my phone, I installed, ClockWorkMod Recovery 5.0.2.7 and I backed up the original ROM, I thought it all went ok but when I rebooted the phone it only goes as far as the white Sony Ericsson logo, I cannot get back into recovery mode to use the backup rom any help would be much appreciated.
Thank you
Restore To stock
Ok here's how to unbrick your play and get it to stock.
First download.
1. Flashtool - http://androxyde.github.com/index.html?1362804082000
2. ftf file for xperia play - http://forum.xda-developers.com/showthread.php?t=1589399
Now here comes the flashing part :
1.Now copy the ftf file to C:\Flashtool\firmwares
2. connect phone via usb
3. flashtool shall recognize your phone.. Hit the lightning (flash button)
4. choose the firmware your just copied to the flashtool/firmwares folder (step 1)
5.click ok
6. Unplug the USB cabel from the phone (you can leave it plugged in the PC)
7. Turn off the phone
8. Press and hold the "Back"/ "Search Button" (i'm not sure which on will work for your phone try both back and search buttons)button on the phone
9. Plug in the USB cable in the phone while holding the back/search button
10.A flashing procedure will start.
Wait till Flashtool finishes flashing
The program will prompt you to power on your phone
Turn on "Uknown scources" and "USB Debugging" (in Settings/Applications/Development)
Done!!
Hit The Thanks Button if Helped
I need help.....
I've been using the stock rom on my xperia play and randomly my Google apps stopped working (google play, Gmail etc) so i searched around and saw that people factory resetted and tried signing into google accs using youtube but none of that worked for me. So i decided to flash a custom rom onto my phone and i got CWM for my phone and downloaded CyanogenMod 9.1.0 for my phone. I used x-parts to reboot into recovery and did the standard procedure for flashing and i got error status 7. So I checked that up and saw that I had change a file into text and delete a few lines to stop this. I did that and then flashed the rom onto my phone and it got stuck so I pulled my battery out and now my phones bricked it just stays on the white sony erricson text part. I'd do the flashtool thing but my fastboot drivers just dont seem to work so it keeps aborting the flash. Please help!
worked as it should thanks very much!
i was using some jelly bean sony rom by divaksh (it had cwm touch) and i wanted to try the new cm10.2 rom by munjeni
i downloaded the cm10.2, put it on my external sd card through a usb micro-sd reader and then put the µsd back in the phone
i selected "reboot to recovery" from the phone's power menu (i had an xposed module for more power menu options)
then i noticed that the phone didn't reboot, but it had turned off completely
i held the power button and the phone vibrated but didn't power on
it powered on on the second try, i then went to the cwm recovery by tapping the volume down key
(i was going to make a backup of the current system, but i forgot it lol)
i flashed the cm10.2 zip (cm10.2_pepper-ota-eng.root_Build.1.zip) without doing any wipes, because i wanted to get to the correct version of cwm recovery
(i would've properly done the wipes/formats from the cwm recovery that is in the cm10.2 kernel)
it finished flashing the zip and i rebooted my phone, but then it didn't power on anymore
now when i hold down the power button, the phone makes a short vibration but nothing else
.
if i plug the phone to a charger, the led lights up (red) for approximately a second and then turns off
if i hold down "volume-down" and the power button, the phone vibrates once and flashes the led (green)
i've tried going into flashmode and fastboot mode but the light doesn't stay on for long and sony mobile flasher doesn't even notice the phone even though the drivers are installed
the "hold down power button and vol-up"-thing also works but it doesn't seem to do anything else than vibrate
what should i do?
Is your bootloader unlocked?
If yes then flahs
Sent from my LT22i using XDA Premium 4 mobile app
Hamza Murad said:
If yes then flahs
Click to expand...
Click to collapse
what?
Is it unlocked?
When I bricked my xperia p I flashed a custom kernel which allowed me to enter Cwm and then flashed the stock rom. I am new to this flashing thing so I recommend that you ask someone experienced what to do. I just shared my experience of recovering from a softbrick. Don't flash new things blindly but ask someone experienced before doing so.
Sent from my LT22i using XDA Premium 4 mobile app
the bootloader is unlocked, and i'm not new to this "flashing thing"
anyone? the phone still hasn't woken up
download firmware for your p and flash using flashtool...
Osku958 said:
the bootloader is unlocked, and i'm not new to this "flashing thing"
Click to expand...
Click to collapse
Have you used flashtool to flash firmware before on that PC?
Have you installed flashtool and it's drivers (sola, flash & fastboot mode).?
Make sure the phobe is off, press power + volume up untill you feel 1 + 3 vibrations and see if it stay in flash mode longer.
Just Flash stock
i have nearly the same problem
my xperia u was running with 4.1 then i restored my ta backup its mine not for someone else then i pressed reboot instead of power off then my phone is dead no vibration no led except the one when i plug it to charger just one red led then nothing
AndroidNoob69 said:
Just Flash stock
Click to expand...
Click to collapse
how? the phone doesn't boot and flashtool doesn't recognize it
Same problem here, I think that Munjeni's post is bad written.
Ok, I fixed it, follow my instructions as they goes. You have to flash the .img kernel that CM10.2.zip comes from.
For flashing it, go as follows...
First try to install the following drivers, with Flashtool. The executable is in C:\\Flashtool\drivers
Run as adminsitrator and follow screen instructions, allow any driver install.
When it's ready, try to plug in the phone in fastboot mode (turn off, hold power and vol up and release power button, led has to turn blue/violet/pink, whatever, a color like that)
Run flashtool.
Flashtool will recognize the phone as the log says, if its not try to install drivers mannually.
If it's recognized then click the black lightning button and select fast boot mode.
At the right side click "Select kernel to flash" and browse the kernel that comes in the .zip. (in the file you've downloaded you have to extract a boot.ini because is the main kernel to make the ROM work, so you have to put somewhere else, I prefer desktop)
When selected, log writes all the procedure until it show an "OKAY[time]" message.
Finally click "Reboot device into system" in the center side and wait until boots.
It should be working now, I spent a lot of hours investigating, but finally I fixed, hope it works for you too!
If there's an error or some question, feel free to post.
manudo said:
Ok, I fixed it, follow my instructions as they goes. You have to flash the .img kernel that CM10.2.zip comes from.
For flashing it, go as follows...
First try to install the following drivers, with Flashtool. The executable is in C:\\Flashtool\drivers
Run as adminsitrator and follow screen instructions, allow any driver install.
When it's ready, try to plug in the phone in fastboot mode (turn off, hold power and vol up and release power button, led has to turn blue/violet/pink, whatever, a color like that)
Run flashtool.
Flashtool will recognize the phone as the log says, if its not try to install drivers mannually.
If it's recognized then click the black lightning button and select fast boot mode.
At the right side click "Select kernel to flash" and browse the kernel that comes in the .zip. (in the file you've downloaded you have to extract a boot.ini because is the main kernel to make the ROM work, so you have to put somewhere else, I prefer desktop)
When selected, log writes all the procedure until it show an "OKAY[time]" message.
Finally click "Reboot device into system" in the center side and wait until boots.
It should be working now, I spent a lot of hours investigating, but finally I fixed, hope it works for you too!
If there's an error or some question, feel free to post.
Click to expand...
Click to collapse
That was "the long run" for windows-guys.
For Linux - no drivers needed anyways - just download fastboot from anywhere and look for kernel. Put them in a personal directory. Open and run in a terminal (some have to be login as su) "fastboot flash boot kernel.img" (or whatever kernel is called...), plug phone in usb, while press and hold power and volume-up buttons. Blue LED comes shining and terminal tell you the flashing.
Unplug or type "fastboot reboot" to re-start phone.
Sure, you also can use FlashTool, too. But for only flashing a kernel it is not needed. Only for flashing stockrom ftf. But this is another story.
i happens to me yesterday
Hi ! Dont worry u r not the first to face this problem i also face this problem yesterday.. my phone was on JB 4.1.2 i download custom ICS rom and install it through CWM Recovery mode, when my new custom Rom starts it stucks on Boot screen and then nothing happens i tried but my phone was in danger... i was worried then i install flash tool and downlaod ICS Rom for Flastool and install that after severals trys i was now ion ICS v4.0.4..
Just Press volume up key and power simultanly when phone vibrtes three time leave it for 30 sec. and then run Flashtool and follow step to install another or same Rom for Falshtool & You r Done ...:good: Sorry for my bad english and type mistakes...
Osku958 said:
i was using some jelly bean sony rom by divaksh (it had cwm touch) and i wanted to try the new cm10.2 rom by munjeni
i downloaded the cm10.2, put it on my external sd card through a usb micro-sd reader and then put the µsd back in the phone
i selected "reboot to recovery" from the phone's power menu (i had an xposed module for more power menu options)
then i noticed that the phone didn't reboot, but it had turned off completely
i held the power button and the phone vibrated but didn't power on
it powered on on the second try, i then went to the cwm recovery by tapping the volume down key
(i was going to make a backup of the current system, but i forgot it lol)
i flashed the cm10.2 zip (cm10.2_pepper-ota-eng.root_Build.1.zip) without doing any wipes, because i wanted to get to the correct version of cwm recovery
(i would've properly done the wipes/formats from the cwm recovery that is in the cm10.2 kernel)
it finished flashing the zip and i rebooted my phone, but then it didn't power on anymore
now when i hold down the power button, the phone makes a short vibration but nothing else
.
if i plug the phone to a charger, the led lights up (red) for approximately a second and then turns off
if i hold down "volume-down" and the power button, the phone vibrates once and flashes the led (green)
i've tried going into flashmode and fastboot mode but the light doesn't stay on for long and sony mobile flasher doesn't even notice the phone even though the drivers are installed
the "hold down power button and vol-up"-thing also works but it doesn't seem to do anything else than vibrate
what should i do?
Click to expand...
Click to collapse
akkufix said:
That was "the long run" for windows-guys.
For Linux - no drivers needed anyways - just download fastboot from anywhere and look for kernel. Put them in a personal directory. Open and run in a terminal (some have to be login as su) "fastboot flash boot kernel.img" (or whatever kernel is called...), plug phone in usb, while press and hold power and volume-up buttons. Blue LED comes shining and terminal tell you the flashing.
Unplug or type "fastboot reboot" to re-start phone.
Sure, you also can use FlashTool, too. But for only flashing a kernel it is not needed. Only for flashing stockrom ftf. But this is another story.
Click to expand...
Click to collapse
If I wrote for Windows 8 there will be more than that, believe me. Managing Android with Linux is a lot easier, from flashing to programming.
But, face it, Windows is the standard here.
manudo said:
If I wrote for Windows 8 there will be more than that, believe me. Managing Android with Linux is a lot easier, from flashing to programming.
But, face it, Windows is the standard here.
Click to expand...
Click to collapse
That's why i'm working over 8 years till now with Linux.
Last night, i accidentally swiped to restore to an older ROM that i had. Not meaning to do this, and beginning to panic, i attempted to stop it, while it was still at 0%. I did this by holding the red button down. As i have now realised how stupid that was, i am wondering if there is any chance to fix it. It is now stuck on the Sony logo. Although i have seen many problems here, i cant find anyone that had the same problem as me. I was running the existenz ROM, and the ROM i was accidentally restoring to was the official ROM. Please help me
Thank you
thetechant said:
Last night, i accidentally swiped to restore to an older ROM that i had. Not meaning to do this, and beginning to panic, i attempted to stop it, while it was still at 0%. I did this by holding the red button down. As i have now realised how stupid that was, i am wondering if there is any chance to fix it. It is now stuck on the Sony logo. Although i have seen many problems here, i cant find anyone that had the same problem as me. I was running the existenz ROM, and the ROM i was accidentally restoring to was the official ROM. Please help me
Thank you
Click to expand...
Click to collapse
Does the phone go into flash mode?
sam_conrad said:
Does the phone go into flash mode?
Click to expand...
Click to collapse
yes, i can access it by holding the up button and power button while insterting the USB cord into the phone
thetechant said:
yes, i can access it by holding the up button and power button while insterting the USB cord into the phone
Click to expand...
Click to collapse
Enter flash mode and flash the stock firmware
thetechant said:
Last night, i accidentally swiped to restore to an older ROM that i had. Not meaning to do this, and beginning to panic, i attempted to stop it, while it was still at 0%. I did this by holding the red button down. As i have now realised how stupid that was, i am wondering if there is any chance to fix it. It is now stuck on the Sony logo. Although i have seen many problems here, i cant find anyone that had the same problem as me. I was running the existenz ROM, and the ROM i was accidentally restoring to was the official ROM. Please help me
Thank you
Click to expand...
Click to collapse
I had the exact same problem, I created a guide to help other people with this problem. Here it is. I can't post links yet but if you want to have a look, search for this on google ( oneplus : Xperia z2 bricked help!! ) It's the first link ( fourms Oneplus Net )
---------------------------------------------------------------------------------------------------------------------------------------
To get Sony's UI/ROM back:
Download and Install Flashtool from here.
Download a proper ( official ) ftf firmware for YOUR phone ( eg Sirius ).
Now copy the downloaded ftf firmware file to ( C:\Flashtool\firmwares )
Open the Flashtool and click on the little lightning rod and choose Flashmode.
Now a window will pop up and ask you to choose firmware for your device, Choose the one you downloaded and click flash.
--------Choosing a wrong one WILL further brick your device--------
Meanwhile, turn your phone completely off, To do this hold the Power button and the volume UP button until you feel your phone vibrate 3 times.
Flashtool will pop up saying you need to put your phone into flash/fastboot mode.
Now put it on fastboot/flash mode ( connect the usb to your computer and hold down the volume up button while plugging the other end to your phone. Your phone's LED should be blue at this stage.
The flashing process will start and once it's done, Flashtool will ask you to unplug the device and restart the phone.
The first boot takes 5-10 minutes.. CONGRATS YOU HAVE UN-BRICKED YOUR PHONE.
Now if you want to root your phone and install a custom recovery ( TWRP ), Download this package and extract it on your desktop
Make sure you have usb debugging turned on ( on your phone )
Navigate inside " to root" folder and run install.bat
Once thats done, to install recovery, navigate inside the " recovery folder " and run install.bat
Make sure to follow on-screen instructions. ( your computer and your phone )
Now you have Rooted sony ROM.
---------------------------------------------------------------------------------------------------------------------------------------------------------------
ArrowHunt3R said:
I had the exact same problem, I created a guide to help other people with this problem. Here it is. I can't post links yet but if you want to have a look, search for this on google ( oneplus : Xperia z2 bricked help!! ) It's the first link ( fourms Oneplus Net )
---------------------------------------------------------------------------------------------------------------------------------------
To get Sony's UI/ROM back:
Download and Install Flashtool from here.
Download a proper ( official ) ftf firmware for YOUR phone ( eg Sirius ).
Now copy the downloaded ftf firmware file to ( C:\Flashtool\firmwares )
Open the Flashtool and click on the little lightning rod and choose Flashmode.
Now a window will pop up and ask you to choose firmware for your device, Choose the one you downloaded and click flash.
--------Choosing a wrong one WILL further brick your device--------
Meanwhile, turn your phone completely off, To do this hold the Power button and the volume UP button until you feel your phone vibrate 3 times.
Flashtool will pop up saying you need to put your phone into flash/fastboot mode.
Now put it on fastboot/flash mode ( connect the usb to your computer and hold down the volume up button while plugging the other end to your phone. Your phone's LED should be blue at this stage.
The flashing process will start and once it's done, Flashtool will ask you to unplug the device and restart the phone.
The first boot takes 5-10 minutes.. CONGRATS YOU HAVE UN-BRICKED YOUR PHONE.
Now if you want to root your phone and install a custom recovery ( TWRP ), Download this package and extract it on your desktop
Make sure you have usb debugging turned on ( on your phone )
Navigate inside " to root" folder and run install.bat
Once thats done, to install recovery, navigate inside the " recovery folder " and run install.bat
Make sure to follow on-screen instructions. ( your computer and your phone )
Now you have Rooted sony ROM.
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Click to expand...
Click to collapse
Thank you so much, as i have a mac, instructions had to be changed a little, but i was able to revert to a proper ROM again, and now have a fully functioning phone again. Thank you so much again.
thetechant said:
Thank you so much, as i have a mac, instructions had to be changed a little, but i was able to revert to a proper ROM again, and now have a fully functioning phone again. Thank you so much again.
Click to expand...
Click to collapse
No problem Always here to help.. if i can
Currently, I'm making a toolkit for all xperia z devices, just hoping it goes according to plan
So thanks to Netflix and its implementation of security net I wanted to install Magisk on my Z2.
Im running the stock 6.0 Rom which was just rooted with supersu.
My tab was charged 80+%
I uninstalled SuperSU, went to TWRP and flashed Magisk.
After flashing the screen stayed black. Nothing at all.
Long press power gives me one vibration after 3 seconds but nothing else.
Long press power & vol - gives me the same vibration
Long press power & vol + gives me nothing
Connecting the tab to the computer gives me nothing. No device recognised (no adb, no fastboot)
Connecting the tab to a charger has the LED blinking red.
Long pressing power makes the led turn solid (no blinking)
Power & vol - the same
Power & vol + nothing
Basically I seemed to somehow have turned my tab into a brick oO
I can't even get it to boot to twrp or fastboot
Atm I'm letting it charge just to see if that was an issue (I doubt it)
Otherwise the only thing I can think of is opening it and disconnecting the battery...maybe that will help?
Seems like Magisk is breaking something badly on the z2 tablet. Mine still boots, but hangs on boot if I restore the rooted kernel backup, and goes crazy (high cpu until spontaneous reboot) if I flash lineageOS and reinstall Magisk.
Of course, flashtool now fails (I'm opening a question on that too).
My sony xperia z2 won't boot after i flashed magisk. it said successful but when i rebooted it didn't boot up
To fix, install FlashTool on PC.
Your data will be safe (at least it was for me).
On the PC, open Flashtool, open XP (XperiaFirm), find xperia z2 tablet at the bottom of the left hand panel. Download the latest firmware for your country (versions are invisible until you select one or click "check all". So select the latest version for your country/region, and click on the box with the version number in it, it will open a window, click "download". (Firmware 1)
While that is downloading, go to Root&Recovery guide on xda, and download the .575 kernel for your device and the R_R4MM rar file. This will be a SIN file. By now, hopefully the download (from XperiaFirm) is done. Now, close XperiaFirm and wait until the download is decrypted (the "please wait" window MUST NOT be closed, it will close by itself)
When it is done, connect xperia to PC while holding down Vol-.
Click the thunderbolt symbol, select Flashmode. and in the window select the firmware you installed from XperiaFirm (should be the only one) and click Install.
After that is done, you can turn on your device. To re-root, turn off and go back into Flash Mode on Xperia (connect xperia to PC while holding down Vol-). On FlashTool, go to Tools, Bundle, Create. Select the SIN file you downloaded (This will compile a kernel firmware). After, on FlashTool, go back to Thunderbolt symbol, Flashmode, select the firmware you compiled and flash. reboot.
Extract the R_R4MM.rar file and open the batch file in it (xperia on with USB debugging on). This will boot you into TWRP, where you can root using SuperSU.zip