If you encounter the problem of IMEI Null or Unknown Baseband in Realme C2 mobile, then the first thing that comes to mind is nvram corruption. But the most important thing to flash nvram is DA Auth File. This file gives us access to nvdata, nvram, proinfo and other sensitive partitions, without which it is not possible to back or restore IMEI. Without it, any tool you use will deny access because these partitions remain in read-only mode..
Some users' mobile Realme C2 does not boot only because the system partition is corrupted. Recovery or factory reset is also of no use because recovery does not have a system image. In this case, the only solution is to install the original firmware using the DA Auth File. If a critical error is occurring during flashing, then most likely you have not added the DA file, or that file is not specific to this model.
Realme C2 DA Auth Files
Note This Da Auth File Only Work On This VersionFlash Tool