Redmi 9 Lancelot Rpmb-nvdata Backup

stands for Non-Volatile Data. This partition is arguably the most important partition for the network capabilities of your device. It contains calibration data for the modem, RF settings, and often links to your IMEI numbers.

You restore RPMB via fastboot or dd. You must use MTK Client while in BROM mode: Redmi 9 lancelot RPMB-Nvdata Backup