Before starting the flash, ensure that:
The phone battery is charged to at least 60–70 %.
A Windows PC (64‑bit) is available with Nothing Flash Tool installed.
All Nothing/MTK/Qualcomm drivers are properly installed.
You have downloaded the correct firmware such as CMF_Phone_1_OS_3.0_20250111.zip from a trusted site like gsmxr.in
Take a full backup, since flashing wipes all user data.