Since the IMEI is tied to the mainboard, buying a replacement motherboard for the LG G8 (which costs roughly $50-$100 depending on condition) effectively gives the phone a new "brain" and a new IMEI.
Unlike older phones where you could manually rewrite the IMEI with simple tools, the LG G8 stores IMEI data in encrypted NV (Non-Volatile) memory partitions. Corruption occurs due to: lg g8 imei repair
Leave a comment below with your LG G8 model (e.g., LM-G820UM) and current Android version for specific repair advice. Since the IMEI is tied to the mainboard,
Before opening expensive software boxes, perform these diagnostics to confirm the issue: lg g8 imei repair
Any unauthorized software modification will void your warranty. Core Repair Methods & Tools