Do not skip major versions (e.g., from EMUI 11 directly to 9). You must downgrade in incremental steps (11 to 10.1, 10.1 to 10.0, etc.) to pass the phone's internal verification. Group version not match error · Issue #7 - GitHub
If you are trying to jump several versions back (e.g., EMUI 11 to 9), the process will often fail. Downgrade in incremental steps (e.g., 11.0.x.211 to 11.0.x.210) to maintain compatibility. Check HiSuite Version Compatibility group version not match hisuite proxy new
“Group version not match.”