Post your exact XZ1 model and current IMEI status (null, 0, invalid) in the comments below, and I’ll guide you step by step.
If you own a Sony Xperia XZ1 and see "Invalid IMEI," "Null IMEI," "Not Registered on Network," or "No Service," you're not alone. This issue often appears after a failed firmware flash, a corrupt TA partition, or an unsuccessful unlock attempt. sony xperia xz1 imei repair