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If your phone is hard-bricked or you want to downgrade from a beta version, you may need to manually flash firmware using or IDT (Image Download Tool) . This requires:

Usually C605 (Latin America Open) or C212 (AT&T/Mexico), though this varies by carrier. Platform: HiSilicon Kirin 710 chipset. Flashing Methods

Download the official HiSuite software on your computer. Connect your device via USB and use the System Recovery