[Huawei Ascend P6, Mate] vargasjj:
Hi, XDA community.

I got this phone today and user reported that suddenly is boot looping until battery dies.

When trying to wipe, stock recovery prompted:

E:failed to mount /cache (Invalid argument)
ensure_path_mounted Failed
E:failed to mount /cache (Invalid argument)

I tried the following so far:

============================================================================

(#1)

If I wipe data or cache I get a big FAIL message and then

E:failed to mount /cache (Invalid argument)
E:failed to mount /cache (Invalid argument)
cust copying files...
copy cust files system error!ret = -1

I have no info if it's running JB or KK, nor B116 or whatever (I assumed it might be running JB).

============================================================================

(#2)

I can ADB and FASTBOOT to it, but device cannot be recognized properly.

C:\huawei>adb.exe devices
List of devices attached
? recovery

C:\huawei>adb.exe reboot bootloader

C:\huawei>fastboot.exe devices
????????(?(???O?(???????(?(? fastboot

I think that the bootloader is locked.

C:\huawei>fastboot.exe oem get-bootinfo
...
(bootloader) locked
OKAY [ 2.201s]
finished. total time: 2.201s

I tried to unlock it with something I found somewhere and apparently it worked:

C:\huawei>fastboot oem unlock UUUUUUUUUUUUUUUU
...
OKAY [ 0.016s]
finished. total time: 0.016s

C:\huawei>fastboot.exe oem get-bootinfo
...
(bootloader) unlocked
OKAY [ -0.000s]
finished. total time: -0.000s

I tried to delete the stock recovery and install TWRP, some other Open Recovery, and it prompted OKAY.

However after rebooting to recovery, is gone, I faced the exact same stock recovery with the same E:failed to mount /cache (Invalid argument) and the big FAIL when trying to wipe.

When going back to ADB and FASTBOOT, the bootloader is back to locked status. I can unlocked again (somehow) with the UUUUUUU thing but I'm not sure if this is actually flashing something.

============================================================================

(#3)

I tried to download Ascend P6 Software (P6-U06,Android 4.4.2,Emotion UI 2.3,V100R001C00B520,Latin_North_America-Channel,05011SYH).zip from the main portal (I am located in LATAM).

http://consumer.huawei.com/ve/support/products/manuals/ascend-p6-ve.htm

I got a UPDATE.APP file of 1.61GB. I copied the file on a 4GB microSD leaving it on the root under dload folder, inserted on the phone and rebooted using VOL+ VOL- combination, not plugged on the USB.

It didn't work. I ended in the same stock recovery with the E:failed to mount /cache (Invalid argument) error and the big FAIL again if tried to wipe.

I am running out of ideas. I will try to get in touch with Huawei later to see if I can get a bootloader unlock code for this phone since I cannot get the Product ID with the *#*#whatever, of course because is bricked.

Does anyone have anything that I might be missing here?

Should I tried with a 4.2.2 stock update.app instead of this 4.4.2?

Thank you so much for your time.

Hope to hear back from anybody.

UPDATE:

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(#4)

I tried to extract and flash the boot, recovery, efi, system, cust, userdata, cache images from the 4.4.2 UPDATE.APP with the latest HuaweiUpdateExtractor_0.9.9.3 I found here. I used the fastboot flash for that (I had to unlock the bootloader again with the UUUUUUU command).

It took all of them with OKAY messages, excepted for the system one which prompted.

target reported max download size of 838860800 bytes
Invalid sparse file format at header magi

And when rebooting, it came back to the boot loop in the ASCEND logo, and when VOL+ VOL- same thing, back to stock recovery with mount /cache error and the BIG FAIL message when trying to wipe.

I am not sure if the thing that I keep getting the bootloader back to locked status everytime and reboot the phone is a bad sign.

Still no progress... will continue tomorrow.