Numerous Android users have been having this issue on their gadgets in the wake of flashing a rom or another, most particularly Techno H6 users. this blunder is for the most part caused by wiping data and curruption of data partiton the baseband form and radio ( Wifi, Imei and system flag ) are controlled by the Nvram (situated in gadget information/Nvram/md/NVRAM/NVD_IMEI once this record are missing or the Nvram is tainted your phone’s imei and radio usefulness stop to exist. this guide applies to all MTK mediatek gadget
How to fix unknown Baseband version, null / invalid IMEI & SIM card not detected
before we proceed download and extract Nvram backup.
=>> After that lunch your es file explorer Go to main menu to enabled root access
=>> scroll down and enable root explorer and click on root explorer
=>> Now locate the extracted Nvram
=>> Copy /cut the Nvram folder and go to the root of your device by clicking the phone icon
=>> paste it in the following directory (data)
=>> Now you’ll be prompt to overwrite the existing Nvram folder tick overwrite all to overwrite
Now close es file explorer and Reboot your device.
When ur device is finally booted, your invalid imei and unknown baseband version would be fixed