Good, look for test point for that model and firmware board software or if the huawei enters upgrade mode sd card method with a folder called dload and inside the update.app, do you have professional tools for huawei to do the operations?
Good, you download the boad software of that huawei model, you do test point, you repair the software, then in upgrade mode you upgrade to the version you want and if everything goes well you repair F4 too, if you do not have to repair original F4 when you have flashed the board software, have I explained myself well?
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