This is what i did to my MI4C with CM13. Now my MI4C with V8.5.1.0 ROM. Hope it help. :)
1. Flash and boot TWRP for 5.1.1
2. In TWRP, flash 6.12.22 ROM and clear/wipe dalvik/cache and reboot
3. Keep having problem to boot up (Some warning msg). So, i keep doing step #1 and #2 until i get the...