only for zenfone 5 tested
important device is out of warranty so use this method.Device in warranty period go to authorize service Center.
download all driver from unbrick zenfone 5 blog.
1.switch off zenfone.
2.press all three button power,v+,v- and hold wait for start zenfone
3.after start show android logo for recovery mode.
4then press v+ and power button or search go to recovery mode
5.connect to pc and go to apply update from adb
6.download zenfone 5 downgrade image from asus support L to kk if mobile have Android L or kk to jb if device have android 4
l to kk aply 126.96.36.199 image than restart if working ok or apply adb to 188.8.131.52
automatic restart droid bot restore and use your zenfone,no need to change main board.
if any problem email at email@example.com