Stop wasting hours trying to flash combination files or searching for "EFS backup" that doesn't exist. Buy the Z3X box, install the drivers, and repair the A52 IMEI in the time it takes to boil water.
: Unlike some tools that only write the IMEI, Z3X excels at "Patch Certificate" operations, which are often necessary to ensure the device can actually register on a network after the repair. samsung a52 imei repair z3x better