I tried to install Android 5.1 (downloaded from the forum), in place of the Remix 2.0 that was originally on my tablet.
I used the Json no erase all with the intel phone flash tool and the flashing work perfectly. But then when starting android it only shows the black chuwi screen and android never loads. Windows is still working fine. I did a wipe factory reset and a wipe cache but with no success
I think that you should be guided by usual common sense.
The cause of an unsuccessful Android flashing can be any of the following. Firstly, perhaps this is a broken ROM file. Secondly, probably you should use flash.json