This backup is your lifeline. Store it in cloud + local drive.

Moto G9 Play Service and Repair Manual - V2.0 | PDF - Scribd

Sometimes, even after flashing, the IMEI stays null because the Qualcomm NV items (particularly item 550) are corrupted. For this, you need or Ultimate GSM Tool — but beware: 90% of “free” downloads contain viruses.

Browse to locate a verified, clean calibration file.