Flashtool not working after lineage/magisk - Xperia Z2 Tablet Q&A, Help & Troubleshooting

Hello,
I made the mistake of installing Magisk trying to deal with safetynet. Now my tablet won't root (on lineageOS) and won't boot if I flash again the patched stock boot.ini and recover the previously working stock backup. Most worrying, flashtool won't work. Can anyone help with this flashtool error?
Code:
26/019/2017 06:19:05 - INFO - Selected Bundle for Sony Xperia Z2 Tablet(SGP512). FW release : 23.5.A.1.291. Customization : VMo FR/DE/AT/CH/BE/NL/PL
26/019/2017 06:19:05 - INFO - Preparing files for flashing
26/019/2017 06:19:24 - INFO - Please connect your device into flashmode.
26/019/2017 06:19:31 - INFO - Device connected in flash mode
26/019/2017 06:19:31 - INFO - Opening device for R/W
26/019/2017 06:19:31 - INFO - Device ready for R/W.
26/019/2017 06:19:31 - INFO - Reading device information
26/019/2017 06:19:31 - INFO - Phone ready for flashmode operations.
26/019/2017 06:19:31 - INFO - Opening TA partition 2
26/019/2017 06:19:32 - INFO - Current device : Unknown: Jul 24 2016/19:28:59 - CB5126LP0H - Unknown: Jul 24 2016/19:28:59 - Unknown: Jul 24 2016/19:28:59 - GENERIC_23.5.A.1.291
26/019/2017 06:19:32 - INFO - Closing TA partition
26/019/2017 06:19:32 - INFO - Start Flashing
26/019/2017 06:19:32 - INFO - Processing loader.sin
26/019/2017 06:19:32 - INFO - Checking header
26/019/2017 06:19:32 - INFO - Flashing data
26/019/2017 06:19:33 - INFO - Loader : S1_Root_9c84 - Version : MSM8974AB_27 / Boot version : S1_Boot_MSM8074AB_LA3.0_M_3 / Bootloader status : ROOTED
26/019/2017 06:19:33 - INFO - Max packet size set to 512K
26/019/2017 06:19:33 - INFO - USB buffer size set to 512K
26/019/2017 06:19:33 - INFO - Parsing boot delivery
26/019/2017 06:19:33 - INFO - Ending flash session
26/019/2017 06:19:33 - ERROR - null
26/019/2017 06:19:33 - ERROR - Error flashing. Aborted
I'm guessing the issue is somewhat related to the "INFO - Current device : Unknown: " part of the log, anyone? I have a backup of the TA partition, if that helps.

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I am having the exact same problem. I installed a Lineage OS rom and I think it had magisk pre compiled in it so that was installed too. I have tried multiple FTF's, 2 different computers (Windows 10 and 7), different drivers, usb ports. It is driving me crazy and I am still trying different things.
I am still able to install different roms, however I am getting random reboots so that is why I want to restore FTF then re flash rcstar's Lineage OS rom as recommended.
I always do full Wipes, even tried internal storage Wipe once hoping that would fix my random reboot problem, but it hasn't. Also most new roms won't even work on my tablet (Castor Windy) due to the setup crashing bug.
Edit:
Also I have used Flashtool before, successfully, on this tablet and it has worked before. But not anymore...
I have installed a 5.1.1 Rom for now and it is stable thankfully.

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Install latest flashtool, it will install the room you selected no matter what kind of tft it was, make sure you selected the correct tft. and if it doesnt work, install a stock rom for the devices via TWRP, to solve the problem, I saw once who was deodexed and rooted on 6.0.1 android version flashable zip. Hope it works

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kiukirimas said:
Install latest flashtool, it will install the room you selected no matter what kind of tft it was, make sure you selected the correct tft. and if it doesnt work, install a stock rom for the devices via TWRP, to solve the problem, I saw once who was deodexed and rooted on 6.0.1 android version flashable zip. Hope it works
Click to expand...
Click to collapse
Hi thanks for the reply.
I have the latest flashtool installed. Also tried different versions. It will not flash any tft no matter what. I have tried multiple including the same exact one I used before.
I haven't been able to find any flashable zips for a stock rom.
I repeat. I have used flashtool before on my tablet and it has worked. It will not work after flashing the latest 7.1.2 Lineage ROM by rcstarr. I am almost certain this is a problem with the tablet and has nothing to do with computer, drivers, files on the computer, ect.
Edit:
I guess I should also mention that I can root and flash roms no problem. And they boot just fine (other than the new 7.0+ builds that give me random reboots) I just can't use flashtool.
Edit again:
Hey OP. I found a flashable zip. I don't think its completely stock but its close. You can try flashing this and then try Flashtool if you want:
https://mega.nz/#!VcxGyRZK!U4NqLOSeg1X_3KNC1_xXm2WnH4_i2OoZ6NwuyaIR6Hw
I am staying on 5.1.1 PAC Rom unless it becomes unstable so I haven't tested it.

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Crwys said:
Hi thanks for the reply.
I have the latest flashtool installed. Also tried different versions. It will not flash any tft no matter what. I have tried multiple including the same exact one I used before.
I haven't been able to find any flashable zips for a stock rom.
I repeat. I have used flashtool before on my tablet and it has worked. It will not work after flashing the latest 7.1.2 Lineage ROM by rcstarr. I am almost certain this is a problem with the tablet and has nothing to do with computer, drivers, files on the computer, ect.
Edit:
I guess I should also mention that I can root and flash roms no problem. And they boot just fine (other than the new 7.0+ builds that give me random reboots) I just can't use flashtool.
Edit again:
Hey OP. I found a flashable zip. I don't think its completely stock but its close. You can try flashing this and then try Flashtool if you want:
https://mega.nz/#!VcxGyRZK!U4NqLOSeg1X_3KNC1_xXm2WnH4_i2OoZ6NwuyaIR6Hw
I am staying on 5.1.1 PAC Rom unless it becomes unstable so I haven't tested it.
Click to expand...
Click to collapse
Ok, I have exactly the same symptoms - flashtool worked with my tablet until I installed LineageOS. I assumed it was Magisk that broke it, but could be wrong. I might try a flashable rom to see if it allows flashtool to work again. In the mean time, I'm going to try restoring the TA partition, as I had a backup done before unlocking the bootloader.
I was able to reflash and run LineageOS now, but with safetynet broken, and some instability.

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Same Problems here - now im on ACIP and its for me the best rom But if i want one day back to real stock, the problem is still there... someone have any ideas?

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Ok I ended up trying the flashable zip I shared and it didn't work. The file flashed successfully but was stuck in bootloop. I tried flashtool anyways but same issue.

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Restoring the TA worked for me. At least flashtool is right now flashing my SGP512!
If you were prevident enough to do a TA backup, all you need is to have root on the tablet and do the following (linux, windows should be similar):
Change to the TA.img directory
Type the commands in bold as-is
adb push TA-18062016.img "/data/local/tmp/TA.img"
(replace TA-18062016.img with the name of your TA image backup)
create a file named restore.sh with the following content (adapted from the old tarestore.sh by DevShaft here):
Code:
#!/system/bin/sh
pl=`ls /dev/block/platform`
for p in $pl
do
platform=$p
break
done
tamd5=`md5sum /dev/block/platform/$platform/by-name/TA`
echo ""
echo "old TA MD5:\n$tamd5"
tamd5=`md5sum /data/local/tmp/TA.img`
echo ""
echo "TA file MD5:\n$tamd5"
dd if=/data/local/tmp/TA.img of=/dev/block/platform/$platform/by-name/TA &> /dev/null
tamd5=`md5sum /dev/block/platform/$platform/by-name/TA`
echo ""
echo "New TA MD5:\n$tamd5"
adb push "restore.sh" "/data/local/tmp/restore.sh"
adb shell "chmod 777 /data/local/tmp/restore.sh"
adb shell
su
/data/local/tmp/restore.sh
That should fix your TA and re-lock your bootloader. After that, flashtool should work again, and you'll be able to flash the stock tft
PS: my Z2 tablet just finished booting into stock ROM, showing the setup wizard now, so it works. I'll see what safetynet shows, before wiping it all again, unlocking boot, and trying LineageOS again.

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Wow that's awesome. Good for you.
I don't have a TA backup or even know what that is lol. I've been on Verizon phones for quite some time now. So my Android knowledge of root, roms, ect. Is pretty limited. Hopefully I can flash a TA zip maybe?
Thanks for keeping us updated.

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Crwys said:
Wow that's awesome. Good for you.
I don't have a TA backup or even know what that is lol. I've been on Verizon phones for quite some time now. So my Android knowledge of root, roms, ect. Is pretty limited. Hopefully I can flash a TA zip maybe?
Thanks for keeping us updated.
Click to expand...
Click to collapse
Check the thread I linked (here). Unfortunately, you needed to do the backup before unlocking the bootloader, and the TA is specific to your tablet....

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jbbandos said:
Check the thread I linked (here). Unfortunately, you needed to do the backup before unlocking the bootloader, and the TA is specific to your tablet....
Click to expand...
Click to collapse
Well damn that sucks. Guess I'll be stuck on Pac Rom for a while then, (maybe forever Lol) at least it runs well.
Thanks again for contributing to this thread.

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What a strange thing, I have been able to flash Lineage 7.1 many times on my SGP521, and always be able to get back to stock via Flashtool, I want to know if anyone having this problem owns this model of Z2 tablet, so I can be able to share the stock rom I got, flasheable by CWM.

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kiukirimas said:
What a strange thing, I have been able to flash Lineage 7.1 many times on my SGP521, and always be able to get back to stock via Flashtool, I want to know if anyone having this problem owns this model of Z2 tablet, so I can be able to share the stock rom I got, flasheable by CWM.
Click to expand...
Click to collapse
I have the SGP512, but anyway, with this issue flashing stock via the recovery doesn't seem to fix it. The only way I got it to flash again with the flash tool was to recover the TA partition.

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Thank you for taking an interest but i have the sgp511

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Hey I got exactly the same problem with my SGP521. I installed lineageOS and after that, my tablet did random reboots every 3- 10 minutes. I got pretty annoyed by that and tried another rom. Problem still existed. So I wanted to get back to Stock Rom with the flashtool. But I get "error: null" right after I plug the tablet with Volume Down. I mean... The tablet is unusable for me, when it reboots 130 times a day.
Is there still no solution?

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Flashtool 0.9.15 works well! This is solution for SGP521

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Psylou said:
Hey I got exactly the same problem with my SGP521. I installed lineageOS and after that, my tablet did random reboots every 3- 10 minutes. I got pretty annoyed by that and tried another rom. Problem still existed. So I wanted to get back to Stock Rom with the flashtool. But I get "error: null" right after I plug the tablet with Volume Down. I mean... The tablet is unusable for me, when it reboots 130 times a day.
Is there still no solution?
Click to expand...
Click to collapse
Just relock your bootloader via flashtool, and install a brand new stock rom via lfashtool too.

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I have the exact same problem. 2 days spent on it, I don't how to fix it.
"Parsing boot delivery” then Aborted.
SP-05F. docomo. Now even the firmware from XperiFirm.exe cannot be installed with flashtool 0.9.23.2.
All drivers setup.
I used TWRP to install AICP.
The tab now only could get in system normally, but WIFI doesn't work either.

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You should try Flashtool 0.9.15. It works with my Z2 Tablet SGP521.

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I have random reboots on my z2 tablet 16gb wifi only, after flashing carbon rom. Any solution ?