It's Dido OS from Y6 Max. It's stable but still have the following bugs:
Bugs:
-Compass not working. (Doogee Y6 Max has no compass)
- You tell me
Changes:
Fix volume low
No bloatwares
No bulsh!t
No virus
Language support: Multilang
Instalation:
1. Download The ROM
2. Important: Having TWRP installed
3. Enter Recovery TWRP
4. Wipe data / factory reset / system / cache / dalvik cache
5. Flash ROM
6. Reboot
Supersu included for this ROM