Q and A for [KERNEL][SGP712/SGP771] AndroPlusKernel v13 - Xperia Z4 Tablet Q&A, Help & Troubleshooting

I have a big problem.
I unlocked the bootloader through Sony's developer-site, then tried to flash AndroPlus' kernel and TRWP. I had to try numerous times, since for some reason it refused to boot to TWRP, even though system booted fine.
Each time I started with flashing (Nordic) stock with Flashtool.
I finally got the tablet to boot to TWRP, but after trying to boot to system, it got stuck in a bootloop. I had to flash to stock again.
Now no matter what I try to fastboot, I get "FAILED (Remote: command not allowed". Flashtool seems to be able to re-unlock the bootloader, but it makes no difference.
If I try to unlock it through Sony, it gives the same error (so fastboot doesn't work _at all_).
Still boots to system fine.
Any help or maybe a solution even..?

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USB-Hub?
@IlariJ
I had the same problem when I hooked up the tablet to my USB-Hub at the monitor.
Diving under the desk and connecting to an USB port at the PC did magic

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DHGE said:
@IlariJ
I had the same problem when I hooked up the tablet to my USB-Hub at the monitor.
Diving under the desk and connecting to an USB port at the PC did magic
Click to expand...
Click to collapse
I tried with different cables and different ports, still the same error.. I even resorted to Sony PC Companion's fix-tool, so I guess I have the regular stock now. I tried to unlock the bootloader again the "official" way, but that error persists.
Flashtool seems to be able to unlock (and relock) the bootloader, but this makes no difference for fastboot.
This is weird since if it had bricked for some reason, the solution would be to wipe my ass with it, but since the system boots and works fine, a little hope still lives.
@AndroPlus , any suggestions?

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IlariJ said:
I tried with different cables and different ports, still the same error.. I even resorted to Sony PC Companion's fix-tool, so I guess I have the regular stock now. I tried to unlock the bootloader again the "official" way, but that error persists.
Flashtool seems to be able to unlock (and relock) the bootloader, but this makes no difference for fastboot.
This is weird since if it had bricked for some reason, the solution would be to wipe my ass with it, but since the system boots and works fine, a little hope still lives.
@AndroPlus , any suggestions?
Click to expand...
Click to collapse
I'm still stuck with this.. Any help?

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IlariJ said:
Any help?
Click to expand...
Click to collapse
Unfortunately not.
http://forum.xda-developers.com/z4-tablet/help/fastboot-getvar-retrieves-t3264589

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IlariJ said:
I'm still stuck with this.. Any help?
Click to expand...
Click to collapse
Did you do anything with MyXperia?

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@DHGE @jelbo
I can honestly say I don't recall doing anything with or to MyXperia. If I accidentally "let" it trigger itself, would this mean that fastboot becomes unusable? For good? Not even a full wipe + reflash could salvage?

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Did you accidentally read the link I provided?

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IlariJ said:
@DHGE @jelbo
I can honestly say I don't recall doing anything with or to MyXperia. If I accidentally "let" it trigger itself, would this mean that fastboot becomes unusable? For good? Not even a full wipe + reflash could salvage?
Click to expand...
Click to collapse
Reading the thread DHGE linked to it seems that MyXperia interference can result in the device being unable to unlock it's bootloader again. That's all I can say, I don't even have my Z4T yet
DHGE said:
Did you accidentally read the link I provided?
Click to expand...
Click to collapse
I'm sorry to ask this, but could you please be a bit more friendly? While IlariJ didn't mention he read your linked topic, he does provide useful info about what he's tried so far. If you know a solution or an answer, it's much more positive to just give him that, even though that might be 'you're out of luck'.

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@DHGE Sorry, I didn't know I wasn't supposed to. My bad.
@jelbo ok, bummer. I really just found (and still find) it hard to believe that fastboot could get permanently messed up, so that even a total reset wouldn't, well, reset it. Thanks, though!

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@AndroPlus @[NUT]
How-to get that TWRP recovery image flashed, so I can get recovery access on my Z4T?

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Enter fastboot mode on Xperia z4. Then type in cmd: fastboot flash recovery <path to twrp_file>
U need the fastboot binary from Google

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Hundsbuah said:
Enter fastboot mode on Xperia z4. Then type in cmd: fastboot flash recovery <path to twrp_file>
U need the fastboot binary from Google
Click to expand...
Click to collapse
Already tried with that..
Only gettings this message;
'fastboot' is not recognized as an internal or external command,
operable program or batch file.
What to do..? :/

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Destroyedbeauty said:
@AndroPlus @[NUT]
How-to get that TWRP recovery image flashed, so I can get recovery access on my Z4T?
Click to expand...
Click to collapse
Hi
You can get it at: https://dl.androplus.org/Xperia Z4 Tablet SGP712_SGP771/
Download twrp_2.8.7.0_(not)fixed.img
you must have the usb driver installed in your PC and adb and fastboot installed from google sdk

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Is there still any update or solution to having MyXperia f'd up fastboot?
I tried to contact Sony that to my knowledge only unlocking the bootloader voids warranty, and since that's impossible because fastboot doesn't work, I should get this fixed. They didn't really refuse (at least after my hard convincing) and told me to contact the seller.
I did, and the seller said fastboot is more of a gimmick-possibility than a "assumed-to-work"-feature of Android (safe to say I don't agree). They sent links to different YouTube-videos on older devices, but I couldn't really find any solution or even a 100%-matching problem.
They also said that if I send this for repairing, the service company would only do a wipe/reset and then bounce the tablet back. Given that the Finnish Sony-service is notorious for making up water damage and/or "mechanic damage" to get to refuse warranty, I'm not really confident to send it there.
And also, to my knowledge the problem is much deeper than what a simple reset would solve, since I've done that and even re-flashed the firmware.
..how is it even possible for a simple software to break the whole fundament of the tablet? So bad even a complete wipe and reflash doesn't help?

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IlariJ said:
Is there still any update or solution to having MyXperia f'd up fastboot?
I tried to contact Sony that to my knowledge only unlocking the bootloader voids warranty, and since that's impossible because fastboot doesn't work, I should get this fixed. They didn't really refuse (at least after my hard convincing) and told me to contact the seller.
I did, and the seller said fastboot is more of a gimmick-possibility than a "assumed-to-work"-feature of Android (safe to say I don't agree). They sent links to different YouTube-videos on older devices, but I couldn't really find any solution or even a 100%-matching problem.
They also said that if I send this for repairing, the service company would only do a wipe/reset and then bounce the tablet back. Given that the Finnish Sony-service is notorious for making up water damage and/or "mechanic damage" to get to refuse warranty, I'm not really confident to send it there.
And also, to my knowledge the problem is much deeper than what a simple reset would solve, since I've done that and even re-flashed the firmware.
..how is it even possible for a simple software to break the whole fundament of the tablet? So bad even a complete wipe and reflash doesn't help?
Click to expand...
Click to collapse
Lets unconfuse me here, i was never in the loop of your issue, but maybe I can help:
Your device won't boot to fastboot at all?
What's the status of your bootloader?

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[NUT] said:
Lets unconfuse me here, i was never in the loop of your issue, but maybe I can help:
Your device won't boot to fastboot at all?
What's the status of your bootloader?
Click to expand...
Click to collapse
This is still the situation :
IlariJ said:
I have a big problem.
I unlocked the bootloader through Sony's developer-site, then tried to flash AndroPlus' kernel and TRWP. I had to try numerous times, since for some reason it refused to boot to TWRP, even though system booted fine.
Each time I started with flashing (Nordic) stock with Flashtool.
I finally got the tablet to boot to TWRP, but after trying to boot to system, it got stuck in a bootloop. I had to flash to stock again.
Now no matter what I try to fastboot, I get "FAILED (Remote: command not allowed". Flashtool seems to be able to re-unlock the bootloader, but it makes no difference.
If I try to unlock it through Sony, it gives the same error (so fastboot doesn't work _at all_).
Still boots to system fine.
Any help or maybe a solution even..?
Click to expand...
Click to collapse
So it seems like it boots to fastboot fine, even Command Prompt shows it listed as a fastboot device, but no command goes through.

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[NUT] said:
Thanks for testing @Hundsbuah and @jelbo.
I'll have a new guide to follow on the same TWRP image later, let's see if I can get it to work properly with a little wiggling, trying to proof-of-concept here... and that isn't easy without the device at hand
---------- Post added at 10:36 AM ---------- Previous post was at 10:33 AM ----------
Ok, so your bootloader is 'unlocked' but fastboot still refuses to flash anything.
That's partially a good thing:
Can you boot to fastboot and then execute run 'fastboot oem unlock' on your pc/mac.
What does fastboot say about that?
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Click to collapse
{
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:crying:

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IlariJ said:
:crying:
Click to expand...
Click to collapse
Can you try:
Code:
fastboot command list
if that says "command not allowed" as well, then your bootloader is probably relocked by means of flashmode.
Try to unlock your device again using @Androxyde's flashtool. After trying that, please attach the log from flashtool.
---------- Post added at 11:38 AM ---------- Previous post was at 11:24 AM ----------
jelbo said:
Code:
C:\Windows\system32>adb shell
~ # ←[6nbusybox lsof | grep touch
603 /system/vendor/bin/touch_fusion /dev/kmsg
603 /system/vendor/bin/touch_fusion socket:[1879]
603 /system/vendor/bin/touch_fusion /vendor/firmware/max11945.bin
~ # ←[6nkill -9 603
~ # ←[6numount /system
~ # ←[6n/vendor/bin/touch_fusion
/sbin/sh: /vendor/bin/touch_fusion: Permission denied
~ # ←[6nbusybox lsof | grep touch
~ # ←[6n/vendor/bin/touch_fusion /vendor/firmware/max11945.bin
/sbin/sh: /vendor/bin/touch_fusion: Permission denied
~ # ←[6n
Click to expand...
Click to collapse
Oh crap... should have known
I'm going to modify my step-guide...
[edit]
now updated.

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[NUT] said:
Can you try:
Code:
fastboot command list
if that says "command not allowed" as well, then your bootloader is probably relocked by means of flashmode.
Try to unlock your device again using @Androxyde's flashtool. After trying that, please attach the log from flashtool.
Click to expand...
Click to collapse
Lists the commands as supposed to(?).
Should I try to unlock anyway?