This self-hosted method requires more technical expertise but has successfully rescued devices that otherwise would not update.
Here’s a technical write-up explaining the error — commonly encountered when using HiSuite Proxy to flash or recover Huawei devices. group+version+not+match+hisuite+proxy+link
HiSuite Proxy relies on a .xml file that declares the group version. Do not use a random XML from the internet. group+version+not+match+hisuite+proxy+link
Open HiSuite Proxy with administrative privileges and populate the setup fields: Paste your Base package URL into the main text field. group+version+not+match+hisuite+proxy+link
This combination has helped many users successfully downgrade devices that refused to cooperate with newer tool versions.
Match the ending of your CUST and Preload strings with the firmware you are downloading.