If you have the Z3X Samsung Tool Pro (with the black dongle), follow this guide.

: Unlike many modern server-based tools that require constant internet and "credits" for every operation, the Z3X Samsung Tool Pro is a robust hardware-software bundle that handles many repair functions offline or with a one-time activation.

Many users face errors when trying to write QCN files on the A52 due to new security encryption. We show you the correct method using Z3X Samsung Tool Pro, including how to properly enable Diagnostic Mode and write the cert/QCN without errors.

Connect the phone to the PC via USB and allow debugging on the screen. Go to the tab. Enter the original IMEI number.

Wait for the phone to boot. Dial *#06# . Your IMEI is back. Check mobile networks.