[ZenFone 2 Q&A, Help & Troubleshooting] cdiogooliveira:
Hello.

I need your help.

I bought this phone (Asus Zenfone 2 ZE551ML 4GB/32GB 1.8Ghz) recently on online store. It is CN version but it already came with WW firmware, but not the latest (I believe it was WW 2.20.40.90 but I'm not sure).

Then I tried to update to the latest WW version 2.20.40.139 by putting firmware zip file from asus site in internal memory. The phone recognized this update and started to upgrade. When it reboot, I got an error of a blinking droid with the word "Error" below, and the phone doesn't boot anymore.

I can get to fastboot mode, but no to recovery mode. When trying to enter recovery, I got some errors (cannot mount /cache...) and it goes back to the blinking droid.

I cannot insert images and urls so the text errors include E:failed to mount /cache (Invalid Argument) various times

In fastboot mode I tried erase cache, format cache, format userdata, flashing latest WW recovery, boot, fastboot and system, but nothing resolved issue of blinking droid with error.

I tried other how to that uses a CWM recovery and I can get to that recovery, can clean and wipe, tried installing asus zip firmware from external sd (WW and CN) but without success (I believe it had CN recovery SKU but WW firmware -is this possible?). After rebooting the phone is still in the same error (blinking droid).

Here is fastboot messages (format userdata gave an error):

C:\adb>fastboot devices
F5AZFG27Z395 fastboot

C:\adb>fastboot flash recovery recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (11882 KB)...
OKAY [ 0.610s]
writing 'recovery'...
OKAY [ 0.470s]
finished. total time: 1.080s

C:\adb>fastboot flash boot boot.img
target reported max download size of 536870912 bytes
sending 'boot' (11870 KB)...
OKAY [ 0.610s]
writing 'boot'...
OKAY [ 0.450s]
finished. total time: 1.060s

C:\adb>fastboot flash fastboot droidboot.img
target reported max download size of 536870912 bytes
sending 'fastboot' (14824 KB)...
OKAY [ 0.700s]
writing 'fastboot'...
OKAY [ 0.460s]
finished. total time: 1.170s

C:\adb>fastboot flash system system.img
target reported max download size of 536870912 bytes
erasing 'system'...
OKAY [ 1.220s]
sending sparse 'system' (524056 KB)...
OKAY [ 18.310s]
writing 'system'...
OKAY [ 11.970s]
sending sparse 'system' (517822 KB)...
OKAY [ 17.540s]
writing 'system'...
OKAY [ 12.340s]
sending sparse 'system' (520627 KB)...
OKAY [ 17.560s]
writing 'system'...
OKAY [ 10.890s]
sending sparse 'system' (522703 KB)...
OKAY [ 17.630s]
writing 'system'...
OKAY [ 10.910s]
sending sparse 'system' (154528 KB)...
OKAY [ 5.450s]
writing 'system'...
OKAY [ 3.500s]
finished. total time: 127.320s

C:\adb>fastboot reboot
rebooting...

finished. total time: 0.110s

C:\adb>fastboot devices
F5AZFG27Z395 fastboot

C:\adb>fastboot erase cache
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.490s]
finished. total time: 0.490s

C:\adb>fastboot format cache
Creating filesystem with parameters:
Size: 268435456
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 1024
Label:
Blocks: 65536
Block groups: 2
Reserved block group size: 15
Created filesystem with 11/16384 inodes and 2089/65536 blocks
target reported max download size of 536870912 bytes
erasing 'cache'...
OKAY [ 0.390s]
sending 'cache' (6248 KB)...
OKAY [ 0.410s]
writing 'cache'...
OKAY [ 0.390s]
finished. total time: 1.190s

C:\adb>fastboot erase cache
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.400s]
finished. total time: 0.410s

C:\adb>fastboot devices
F5AZFG27Z395 fastboot

C:\adb>fastboot format userdata
Creating filesystem with parameters:
Size: 27984359424
Block size: 4096
Blocks per group: 32768
Inodes per group: 8176
Inode size: 256
Journal blocks: 32768
Label:
Blocks: 6832119
Block groups: 209
Reserved block group size: 1024
Created filesystem with 11/1708784 inodes and 151285/6832119 blocks
target reported max download size of 536870912 bytes
erasing 'userdata'...
OKAY [ 4.290s]
sending 'userdata' (139033 KB)...
OKAY [ 4.600s]
writing 'userdata'...
FAILED (remote: flash_cmds error!
)
finished. total time: 9.180s

C:\adb>fastboot format cache
Creating filesystem with parameters:
Size: 268435456
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 1024
Label:
Blocks: 65536
Block groups: 2
Reserved block group size: 15
Created filesystem with 11/16384 inodes and 2089/65536 blocks
target reported max download size of 536870912 bytes
erasing 'cache'...
OKAY [ 0.370s]
sending 'cache' (6248 KB)...
OKAY [ 0.420s]
writing 'cache'...
OKAY [ 0.380s]
finished. total time: 1.170s

C:\adb>fastboot format userdata
Creating filesystem with parameters:
Size: 27984359424
Block size: 4096
Blocks per group: 32768
Inodes per group: 8176
Inode size: 256
Journal blocks: 32768
Label:
Blocks: 6832119
Block groups: 209
Reserved block group size: 1024
Created filesystem with 11/1708784 inodes and 151285/6832119 blocks
target reported max download size of 536870912 bytes
erasing 'userdata'...
OKAY [ 4.050s]
sending 'userdata' (139033 KB)...
OKAY [ 4.490s]
writing 'userdata'...
FAILED (remote: flash_cmds error!
)
finished. total time: 8.840s

C:\adb>fastboot reboot
rebooting...

finished. total time: 0.108s

C:\adb>

Is there a way to get the phone working again?

Thank you very much.