im new to this community but is it possible to install android 6.0 on a non-nexus phone with a universal install image
if not please tell
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I guess, the answer is NO, unless the phone you are using is Nexus or is the exact copy of Nexus (with the same specs, no changes at all).
The factory images that Android releases for Nexus are optimised for Nexus devices only and won't work on others. Trying to fastboot flash such images might brick your device for good.