ZenFone Max (M1) ZB556KL
Please download this version from official site.
ZB555KL Android 10 Developer Image Version:WW-17.00.2003.23 For WW SKU only* (exclude JP SKU)
1.Android 10 developer version is now available for downloaded.
2.This is the Android 10 AOSP version, so the user experience will be very different from Android 8 (Oreo) and 9(Pie). If you are used to Android 8 (Oreo)/Android 9 (Pie) system, we will recommend that you use the current device version.
3.Please back up your data before upgrading to Android 10. System will factory reset after upgrade process completed.
4.If you want to downgrade software to previous OS by official package, please factory reset your device after downgrade process completed.
5.Updated Android security patch