If you are still getting the error, it might be due to the file index. For instance, if your device expects a specific CUST index (like ELS_N29_CUST ), you must ensure the CUST file you added matches that, rather than just any random firmware found. Detailed Solution Example (Mate 30 Pro/P40 Pro)
If you are rolling back, don't skip versions. Downgrade from EMUI 11 to 10.1, then 10.1 to 10.0, rather than skipping directly to an older version. Enable HDB and Developer Options: group version not match hisuite proxy new
HiSuite Proxy is a specialized open-source software tool designed to modify Huawei's official HiSuite PC application. It intercepts and redirects network requests, enabling users to download and install firmware versions, including downgrades, that would otherwise be unavailable through official channels. The tool emerged around 2020 within the Android modding community to address restrictions in Huawei's update mechanisms, particularly for devices running EMUI. If you are still getting the error, it
Once the links are pasted and the version string is entered, click the button in HiSuite Proxy, then open Huawei HiSuite on your PC. It should now show the new firmware version. Click "Update" and ensure you check the "Switch to other version" box if available. New Methods and Best Practices for 2026 Downgrade from EMUI 11 to 10
: The Base firmware version does not match the required Custom (Cust) or Preas versions in the HiSuite Proxy list.