Download MIUI V11.0.5.0 Russia Stable Recovery ROM for Redmi 9 from here. Download previous firmwares from here.
File name: miui_LANCELOTRUGlobal_V11.0.5.0.QJCRUXM_a835536aa9_10.0.zip
Device: Redmi 9
Codename: #lancelot
Region: Russia
Version: V11.0.5.0.QJCRUXM
Android: 10.0
Size: 1.8 GB