This is not my work and I am simply sharing it for the community. All credits to the developers.
MIUI 10 8.8.9 Kosmos2011 Edition
https://yadi.sk/d/dRUXr9B83aEZUW
There is an updated version of this rom on 4pda.
I have flashed the rom for 3 days now.
Just flash the rom and magisk 16.6 via TWRP 3.2 and also I flashed Wicked Wick's Doubly and Viper Patch.
In the end, i flashed fix for oreo video playback non treble version.
I wiped system as well.. Clean instal with factory reset.
Took some time to boot but worked non the less.
MIUI features work as expected. Sync and everything worked well.
Everything works which you expect to work.
Camera works. Also comes with Footej camera apart from standard. Both work well
Charging speed is decent enough, Took like 1 hour 50 minutes to charge fully. Not sure if that is quick charge.
NFC did not check
Rom feels Smooth and does not give me any issue. I feel it is better than MIUI 9.
Bluetooth audio sound is better and clear.
Good battery . You can get SOT of about 8 hours. I usually get about that on average 1.5 day of standby. Can stretch up to 10 hours if I watch a movie or so and be in a good reception area. you need to disable apps running in background from MIUI battery saving to custom and select close app to save power for every app except which need to be running in the background like WhatsApp telegram etc.
Themes do not work. You can not change your region from china, however, your previous liked themes all work and automatically loaded into the themes. I tried to make a MIUI patch to fix it , did not work.
Device does get a bit hot on charge so I throttled the phone settings so after that It was like 41-43 C but I have used kernel auditor to change CPU frequencies
Little till 1400 and Big only till 1800 and it works great.
Also I changed governor to conservative
still not lags or any performance flaw
Overall great effort and I am happy with it.
Side key doesnot work though!
You can use one button to control all 3 buttons in this rom as well.