Dot OS 2.5 based on Android Oreo 8.1 absolutely looks like Android 9.0 Pie’s User Interface so enjoy it !
This Rom for Redmi 5 Rosy is very stable for every day use & far more smoother than MIUI 9 & 10 so I uploaded this Dot OS 2.5 UNOFFICIAL Rom here because it was deleted from Google Drive from XDA Post
Flash Rom in General procedure like wiping before installing in TWRP Recovery & install fp fix.zip in TWRP after installing the Rom for FingerPrint Fix & Flash GApps for Google Apps & Play Store from here or at https://opengapps.org/ & choose ARM64>8.1> and try to use lighter GApps for better performance
I am just sharing this Rom here because it saved my phone, i thought i need to buy a new phone because the 2GB Ram edition lags a lot with Default MIUI 9 & 10 but afterwards i flashed this rom & it saved my phone
Here is the Original XDA Link :- https://forum.xda-developers.com/redmi-5/development/rom-dotos-2-5-t3870425
※Please make a backup of your device before installing or updating ROM