Huawei often blocks "jumping" over major versions. You may need to downgrade to an earlier build of your current EMUI version first, then to the target version (e.g., 11.0.0.260 → 11.0.0.151 → 10.1).
: Downgrading across major EMUI versions (e.g., 11 to 10) can sometimes disable USB connectivity or fast charging. Ensure you follow a step-by-step incremental downgrade path. step-by-step guide for a specific Huawei model or EMUI version? Group version not match error · Issue #7 - GitHub 8 Jul 2020 — group version not match hisuite proxy work
To avoid the error entirely, follow this workflow: Huawei often blocks "jumping" over major versions
The specific software package build you selected. Ensure you follow a step-by-step incremental downgrade path
Understanding why this error happens and how to fix it will help you successfully flash your device without bricking it. What Causes the "Group Version Not Match" Error?