The error is terrifying, but on Qualcomm devices, it is fixable roughly 85% of the time via software. Unlike MediaTek or Exynos, Qualcomm provides engineering tools (QPST, QFIL) that allow deep-level restoration.
After applying fix, verify:
Note: Without a backup, extract persist.img from a full factory image or QFIL backup. baseband unknown fix qualcomm
Boot the phone. Check . It should now display a version number. IMEI ( *#06# ) should return. The error is terrifying, but on Qualcomm devices,
: Frequently occurs after flashing an incompatible ROM, a failed system update, or corrupting the NVRAM/NVDATA partitions. Firmware Mismatch The error is terrifying