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zenfone 5 ze620kl unlock bootloader failed

Star II
I used asus unlock bootloader apk with version
firmware version ww_15_0616_1803_8
it showed error message " error occured... maybe network problem..."
I have been tried so many times with very fast wifi and lte network.
Is there any last apk for unlocking bootloader or other method ?
Thank you

Star II

Placeholder ..

If Asus-Update in step 1 did not happen automatically, maybe try to copy this ROM to the internals storage as in step 2.

Star II

Hi @ErwinGau ,
I thought nobody have solution. 
I have tried and successfully upgrade to stock asus android 10.
When on fastboot mode and i plugged usb, the screen become black and only showed very small "any key to shutdown"
The command "fastboot getvar secret-key-opt > secret.txt" only return "< waiting for any device >"

what should i do ?
Any spesific driver need to be installed on my laptop windows 10 ? 
Thank You

Star II

Hi @ErwinGau 
After tried with another laptop, Unlock bootloader was successfully.
Now my zenfone 5 running with custom room pixel experience plus.