Bootloop Z3 CM12.1 nightly/M5 9.0 - halp?

[Errrwin]

Hm. Not good.

My Z3 has an unlocked bootloader and is rooted. It runs the latest CM 12.1 nightly and today I had the brilliant idea of flashing the M5 V9.0 kernel.

After flashing the kernel, my phone got into the much feared bootloop. Shows Sony on the screen, screen goes black, shows Sony on the screen, screen goes black, rinse/repeat. No flashing LED, no way (that I know of) to get into CM recovery.

Any thoughts on how to revive my Z3?

Or will this turn out to be one of those expensive mistakes?

 

[Hnk1]

Hm. Not good.

My Z3 has an unlocked bootloader and is rooted. It runs the latest CM 12.1 nightly and today I had the brilliant idea of flashing the M5 V9.0 kernel.

After flashing the kernel, my phone got into the much feared bootloop. Shows Sony on the screen, screen goes black, shows Sony on the screen, screen goes black, rinse/repeat. No flashing LED, no way (that I know of) to get into CM recovery.

Any thoughts on how to revive my Z3?

Or will this turn out to be one of those expensive mistakes?

Oh mate, just keep it easy. You will fix your phone in ten minutes. I have done that so many times that I hardly remember.

If you can boot into recovery, you will need to flash CM12 or any custom rom again. Make sure you wipe your data beforehand from recovery.

If you can not boot into recovery,You will need to flash FTF file using FLASHTOOL .

This is one thing you MUST not forget . ALWAYS make sure you flash the right FTF for your device. DO not flash it for another device or you might end up making an expensive mistake.

Flashtool
http://forum.xda-developers.com/showthread.php?t=920746

Download it from here
http://www.flashtool.net/index.php


How to use flashtool
http://forum.xda-developers.com/showthread.php?t=2658952

http://forum.xda-developers.com/xperia-l/general/xperia-l-how-to-flash-tool-unlocking-t2337955



REMEMBER TO DOWNLOAD AN FTF FROM YOUR DEVICE GENERAL SECTION as the guides are for different devices and the process is same expect FTF file.

Now flashtool even allows you to download FTF from the app itself.

Quote me back in case you still need help!

Good Luck

 

[Errrwin]

Oh mate, just keep it easy. You will fix your phone in ten minutes. I have done that so many times that I hardly remember.

I suppose the hardest part is getting hold of a Windows computer.

Thanks a lot, I'll report back when I get the chance to do this. :good:

 

[Richy99]

make sure you have the fastboot drivers installed for your device on the computer, turn the phone off, plug it into the computer, hold down the volume up key and turn it on, it should then go into fastboot mode wher eyou can flash the cm12 kernel to the device

if that fails then you might need a full install from scratch which is what the above suggested

 

[Hnk1]

I suppose the hardest part is getting hold of a Windows computer.

Thanks a lot, I'll report back when I get the chance to do this. :good:

Sure, feel free to quote me any time. I'd be glad to help.

make sure you have the fastboot drivers installed for your device on the computer, turn the phone off, plug it into the computer, hold down the volume up key and turn it on, it should then go into fastboot mode wher eyou can flash the cm12 kernel to the device

if that fails then you might need a full install from scratch which is what the above suggested

Cheers mate for your suggestion. I didn't go in details as I felt it might be a bit confusing for him to follow so many instructions.