This is the most common method used by technicians. It involves using specialized tools to communicate directly with the Spreadtrum modem processor.
Some users flash a patched boot image that disables signature checks, then write a new IMEI. This (e.g., on KaiOS 1.x on the JioPhone). However, on newer devices (KaiOS 3.x), this triggers a hard brick because the bootloader checks the entire system integrity. Moreover, changing your IMEI to any number other than the original is a crime in many countries. kaios imei repair work
Select the and AP_DB files (found inside your phone’s specific firmware folder). Click Start , power off the phone, and connect it to the PC. This is the most common method used by technicians