ASUS ZenFone2 (ZE550ML) software Image: V52.20.40.156 for WW SKU only*
This is downgrade firmware from Andriod M to Andriod L .
Please ensure backup data before downgrade.
Downgrade to V52.20.40.156 (Andriod L)
Steps of Update:
1.Check software version of your device**
2.Download device software and Update SOP (From “Manual” Item)
3.Only apply to same SKU update, Example: WW->WW, CN->CN, TW->TW.
4.Software update cannot transfer the software SKU and downgrade the software version.
5.Wrong SKU may cause update failure, please update the same SKU version only.
*How to know the device model?
Path: Settings->About-> Model number
Example: ASUS_T00I
**How to know the device software version?
Path: Settings->About-> software information->Build number
***System downgrade may cause part of data missing, please buckup your important data before system downgrade