Download Twrp v3.5.1 recovery for Redmi Note 9s/9pro/max/Poco M2 Pro (Miatoll) - Xiaomi Authority
How to Root Redmi Note 9 via Magisk without TWRP - DroidWin
Redmi Note 9 Pro Install TWRP and ROOT - YouTube
GitHub - mauronofrio/android_device_xiaomi_curtana: TWRP tree Unified for Xiaomi Redmi Note 9/9s/9Pro/9 Pro Max/Poco M2 Pro (curtana,gram,excalibur,joyeuse)
Xiaomi Mi 10i / Mi 10T Lite / Redmi Note 9 Pro 5G (xiaomi-gauguin) - postmarketOS
How to Install TWRP on Redmi Note 9, Note 9 Pro : Flash custom recovery - DigiStatement
TWRP for Xiaomi Redmi Note 9S / Pro (wzsx150) | Unofficial Xiaomi European Community | MIUI ROM Since 2010