This Post will help you to upgrade Zenfone Max to Marshmallow 6.0.1beta
If you are in the newest lollipop WW_V12.8.10.82 , these steps below will OK, If your version is older, you will got "FAILED (the remote: CAN not an unsigned image of flash) " but do not worry, we can still flash 6.0.1. Please see below :

A. ROM need dowload : ROM Download
Or here : ROM

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