This is a professional paid service tool. Recent updates (v.3.1.5 and later) added support for direct IMEI repair on the LG G8 ThinQ series.
Repairing an IMEI on the LG G8 generally requires specialized service tools rather than standard consumer software. Professional Service Boxes : Tools like Octopus Box Octoplus LG lg g8 imei repair
Interrupting a firmware update via LGUP can corrupt the modem files. This is a professional paid service tool
Repairing an LG G8 IMEI is significantly more difficult than older LG models (like the G4 or G5). The G8 uses Qualcomm's secure boot architecture, meaning you cannot simply write a file via Fastboot or ADB. lg g8 imei repair
Understanding LG G8 IMEI Repair: Methods, Legality, and Risks