Develop Bugs

[Q] 'Secure boot Error!' at boot, download mode and factory reset don't work

Hello,
Here is what led to my issue:
I rooted my phone using this method: http://forum.xda-developers.com/showthread.php?p=38886073#post38886073
Downloaded clockwork rom manager.
Here comes the thing I don't remember. At least i know that the last thing i did was to click on 'backup current rom'
After this the phone reset itself and this message came up:
Secure booting error!
Cause: boot certification verify
Then i tried to reset using the power button, which led me to the 'battery full' screen - afterwards i was able to reboot. As stupid as I am I just tried the same thing again. And ever since i am stuck at the 'Secure booting error!' screen.
I am unable to enter download mode. I get to the 'Hard factory reset' screen, but if i accept doing so, it says 'Secure booting error!' again.
I also remember clicking on 'restart into recovery mode' at some point, but this is not the last thing i did.
I am really desperate. Please, help me!

Well i had the same issue today... It happened after i did two changes. One of them was to to try to relock from freegee and flash twrp again from freegee. In my case i was able to go in download mode and flash original kk rom with lg flash tool.

Unfortunatly, trying to boot in downloadmode, i still get the same error :/

Jubi-Wan said:
Unfortunatly, trying to boot in downloadmode, i still get the same error :/
Click to expand...
Click to collapse
How are you trying to boot into download mode? And what factory reset screen? It seems as though you did not unlock the bootloader using freegee, if you make any changes and relock the boot loader you will get that error. But it seems that it has not been unlocked. If you hold power and volume up what happens? Same thing when power and volume down, one of them is recovery (possibly factory reset you are seeing) and the other is download mode. I don't remember right now but you should read the whole softbrick thread and see if you are missing something. You may need to use LGPNST to go back to stock, you can also use that program to flash a new recovery so read carefully and follow all steps.
When this happened to me I was able to flash an unlocked bootloader and it allowed me to use my phone again as it was before doing something stupid (for me it was an attempt to re lock the bootloader).

well, i managed to get into download mode. Obviously i used the wrong method to get into download mode...
I used this method and everything worked fine, so far. : http://forum.xda-developers.com/showthread.php?t=2249500
My phone doesn't boot now. Fast Boot doesnt work aswell.
All that happens is a white battery showing on the screen and when i try to fastboot all that happens is that the LED is blinking or glowing red after some while.

Jubi-Wan said:
well, i managed to get into download mode. Obviously i used the wrong method to get into download mode...
I used this method and everything worked fine, so far. : http://forum.xda-developers.com/showthread.php?t=2249500
My phone doesn't boot now. Fast Boot doesnt work aswell.
All that happens is a white battery showing on the screen and when i try to fastboot all that happens is that the LED is blinking or glowing red after some while.
Click to expand...
Click to collapse
What do you mean when you try to fastboot? Fastboot is basically the bootloader and allows you to select recovery or download mode. What you should have done after following that thread is go to recovery and wipe everything and flash a new ROM.
If you are saying that the bootloader is not coming up and allowing you into recovery then I believe something was missed.

After trying out some varioants of this it worked: http://forum.xda-developers.com/showthread.php?p=40274560&highlight=red+led#post40274560
I wiped the phone, but since I had to leave over the weekend i just turned it off and went away.
Now that I am back, nothing works now :/ The Phone doesnt react to anything, not even donwload-mode.
Is the battery too low maybe? It's on the wall now for a few hours, but it still doesn't react. It's not warm either.
edit:
when i charge the phone, i will get a 'watchdog bark' after some time allowing me to get into recovery. accesing downloadmode from there doesn't do anything. strangely, the recovery isnt trwp although it should be because teenybin comes with it. it's 'bbs.gaodi.net' which doesn't have a sideload feature. what do i do now?
edit2:
after 10000 tries i got into download mode. i don't want to **** up now so i won't do anything until i know exactly what to do.
any advice?
edit3:
got it working by flashing another teenybin which included trwp - then i installed miui via sideload. i don't have signal though, but i will open another thread for this since this is another issue.

H815 kernel crash/storage error (?)

Hey there,
I use a LGG4 international version (H815). It is rooted and runs AICP Rom (MM 6.0.1). Xposed is not installed. It runs latest SUPERXE kernel.
While browsing the web it randomly got a blackscreen and an error message (some kind of log whats happening) showed up. It said that the kernel crashed. Rebooting did nothing, even while it booted the same error screen shows up, but this time with a green background. I booted to twrp and wiped everything, reinstalled the kernel and the system. And again, the same green error screen. I tried again and i could actually use the rom (Latest Genesys rom) for some minutes, then i got a random reboot. Even twrp hanged itself up and/or rebooted. Now I dont have any system installed and cant boot to twrp because the green error screen (see attached pic) shows up after the twrp boot screen. Is my phone ****ed?
Oh, and my external SD somehow died, cant recover it from windows or any other phone. So maybe the storage of the phone itself is damaged too?
Please help!
Thanks in advance

Aicp =/= stock rom.

Pfeffernuss said:
Aicp =/= stock rom.
Click to expand...
Click to collapse
I know, that's why I switched back to a stock based rom. And I tried too with completely LG stock rom, same issue.

I think I hardbricked my Zuk z2?

So guys
I was on twrp and tried to flash a new rom but when it rebooted after the install, my Zuk z2 died.
It does nothing now. If I press the powerbutton for a long time it shortly vibrates for one second and the notification light also lights up for 1 second, but does not boot up. I tried volume combinations, don't work either.
What can I do guys?

Well, this guy managed to fix it
. Not sure if its the best way to fix it but it's still something

Effected said:
So guys
I was on twrp and tried to flash a new rom but when it rebooted after the install, my Zuk z2 died.
It does nothing now. If I press the powerbutton for a long time it shortly vibrates for one second and the notification light also lights up for 1 second, but does not boot up. I tried volume combinations, don't work either.
What can I do guys?
Click to expand...
Click to collapse
https://zukfans.eu/community/threads/how-to-unbrick-zuk-z2-from-diagnostic-port-900e.2856/ follow the steps

https://forum.xda-developers.com/lenovo-zuk-z2/how-to/deep-flash-revive-zuk-z2-hard-brick-t3577146
Use this if you didnt success from other methods.

tlxxxsracer said:
My video. The brick occurs when you usually backup a room with one version of twrp, flash another variant of twrp and then restore the nandroid from before.
Happened to me. Flashed MIUI, and then tried to restore a nandroid (not realising the TWRP changed).
Hope the video helps. Plus then you have a cable premade in case it happens again
Click to expand...
Click to collapse
Hello. Maybe you can give me some advice. I am stuck in engineering/diagnostics mode after I accidentally selected that option when I was in the bootloader trying to flash TWRP.
Basically, I had installed TWRP and Mokee 7.1.1. I wanted to check out the original chinese ROM so I relocked, flashed with QFIL, etc. I had first flashed MM, then I flashed latest chinese Nougat official.
I didn't like it, so I was trying to unlock the bootloader again, and in the process I ended up selecting the diagnostics/engineering mode. The phone was stuck there and I had no way of accessing the bootloader to reflash with QFIL or MiFlash
TO try to fix, I used the deep flash method you describe in the video, only I found it in zukfans. I was able to open the 9008 port, flash with QFIL/MiFlash. Even though both tools describe the flash as successful, on boot, it goes back to engineering mode.
How to I get out of there? Is my phone done?
Thanks!

LG G3 D855 "Secure Boot error"

I know this has happend to other people, but nothing worked for me. Maybe some of you guys had same problem.
I can't go into "Download mode"
My PC doesn't recognize device
But I can go into recovery. I have flashed latest recovery. Tried flashing latest LOS (it flashes without any errors) but still when restarting I'm getting "Secure Booting Error" and after screen goes black red and blue led starts to flash

LTMendarynas7 said:
I know this has happend to other people, but nothing worked for me. Maybe some of you guys had same problem.
I can't go into "Download mode"
My PC doesn't recognize device
But I can go into recovery. I have flashed latest recovery. Tried flashing latest LOS (it flashes without any errors) but still when restarting I'm getting "Secure Booting Error" and after screen goes black red and blue led starts to flash
Click to expand...
Click to collapse
If you have flashed twrp, does it work to reboot to download mode from it?

SnowFuhrer said:
If you have flashed twrp, does it work to reboot to download mode from it?
Click to expand...
Click to collapse
How I didn't tried that... Yes it does, it says "firmware update" and stucks there
I think I need to try https://forum.xda-developers.com/showpost.php?p=64624324&postcount=2 this metod..I'll give it a try
P.S Done it. Now Im back to stock, it's time to go custom again

Z2 Plus Boot issues

I was on AEX and tried a new roms (Pixys, Evolution, Pixel Experience etc) and none of them booted the android.
Tried to restore AEX and even that is not booting. Phone keeps rebooting in loop without booting to any os including the restored backup.
Evolution and pixel after a clean installation says "no os".
Phone stays in start mode and does not move beyond this point.
Phone boots to twrp recovery.
Any idea what is wrong? Have corrupted the phone that it can't be used?
Is there a way out?
Quick solution would be highly appreciated.
Thanks

Anyone has a solution/suggestion for this?Deperate now since there is no alternate phone.
Thanks again

The phone boots recovery and adb commands work whereas fastboot commands don't work. I am able to flash vendor2factory and rom successfully with no error but the phone still not boot android but vibrates and goes back start screen and if i don't press any keys it restarts again after showing the ZUK logo.
I hope i have been able to explain the situation. I am still not able to boot the android despite trying more than one rom.
Anyone has any clues? Thanks

ramadurair said:
I was on AEX and tried a new roms (Pixys, Evolution, Pixel Experience etc) and none of them booted the android.
Tried to restore AEX and even that is not booting. Phone keeps rebooting in loop without booting to any os including the restored backup.
Evolution and pixel after a clean installation says "no os".
Phone stays in start mode and does not move beyond this point.
Phone boots to twrp recovery.
Any idea what is wrong? Have corrupted the phone that it can't be used?
Is there a way out?
Quick solution would be highly appreciated.
Thanks
Click to expand...
Click to collapse
I am having the same problem. I was in pixel experience and i flashed latest pixel experiences august security patch, it showed no os but it booted. But there were several bugs in the rom, i thought it was roms problem and then i tried to flash evolution, it again showed no os after flashing and then i got stuck at evolution x boot logo. So, i tried to qfil zui but to no avail, the flashing process won't even start the qpst tool just freezes after pressing the download button. Then in the twrp i noticed that battery percentage is different at different times sometimes it shows correct value but somes it won't so i thought that the problem might be from twrp and then i flashed new twrp but again same problem. Then i flashed arrow os 10.0 without gapps, it booted successfully then i flashed gapps. After sometime i tried to flash evolution x but got stuck at boot logo again. Finally i flashed arrows os again it booted successfully (i flashed rom and gapps separetly)
So, FINALLY THE TEMPORARY SOLUTION IS TO FLASH ARROW OS IT WILL BOOT SUCCESSFULLY BUT THEN AGAIN OTHER ROMS WON'T BOOT. IF I FIND ANY SOLUTION I WILL POST HERE

muralee krishna said:
I am having the same problem. I was in pixel experience and i flashed latest pixel experiences august security patch, it showed no os but it booted. But there were several bugs in the rom, i thought it was roms problem and then i tried to flash evolution, it again showed no os after flashing and then i got stuck at evolution x boot logo. So, i tried to qfil zui but to no avail, the flashing process won't even start the qpst tool just freezes after pressing the download button. Then in the twrp i noticed that battery percentage is different at different times sometimes it shows correct value but somes it won't so i thought that the problem might be from twrp and then i flashed new twrp but again same problem. Then i flashed arrow os 10.0 without gapps, it booted successfully then i flashed gapps. After sometime i tried to flash evolution x but got stuck at boot logo again. Finally i flashed arrows os again it booted successfully (i flashed rom and gapps separetly)
So, FINALLY THE TEMPORARY SOLUTION IS TO FLASH ARROW OS IT WILL BOOT SUCCESSFULLY BUT THEN AGAIN OTHER ROMS WON'T BOOT. IF I FIND ANY SOLUTION I WILL POST HERE
Click to expand...
Click to collapse
Now the phone is not even booting into recovery after i did a qfil install on zui rom. Looping into start screen only.

ramadurair said:
Now the phone is not even booting into recovery after i did a qfil install on zui rom. Looping into start screen only.
Click to expand...
Click to collapse
When you qfil, the recovery will be lost i think. But since you cannot enable usb debugging i think you wont be able to flash twrp.
---------- Post added at 07:26 AM ---------- Previous post was at 07:19 AM ----------
ramadurair said:
Now the phone is not even booting into recovery after i did a qfil install on zui rom. Looping into start screen only.
Click to expand...
Click to collapse
I think the problem is our phone is not able to boot big rom i.e. roms of size close to 1gb or more than 1gb since arrow os without gapps is only 600mb my phone is able to boot. If you are able to find the solution or get your phone repaired at any cell repair centre please let me know

bro is your phone working now