Dunno if can help, but here's the MIUI 8 v6.7.18 beta (july 18, 2016) for Alcatel One Touch POP 2 (5) Premium (basically the unbranded Smart Prime 6):
https://dailyuploads.net/y9edsr3tkw9x
Note that I didn't tested it on my Prime yet, so I don't know what bugs it has...
Do not install this.
It bootloops and I can't access recovery (yet).
I manage to use sugar by pwr+vol up and get to download mode.