You can Upgrade/Downgrade huawei smartphones with Stock ROM file. First of all, you need to download the official stock ROM from the above given-link flash your device. With Flash file, you can also re-install the Stock Firmware on any Android device. You can also install this firmware zip file when you are facing Software Issue, Boot loop Issue, and much more. It will also help you with IMEI Issue/Dead Issue. You may also repair your huawei device using Stock ROM Firmware Flash File.
Official Huawei Nova CANNES-L01 Stock Rom
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