Steps:
- Prepare and Notice
A. Warning! Flash phone might get it bricked. I am not responsible for it.
B. Phone is already Oreo firmware, only tested same brand update and downgrade.
C. Backup data, it might be restore factory default setting especially using downgrade ROM version.
D. Unlock bootloader before flash steps.
E. After update successfully, device might be locked again.
F. HWOTA8 Package (HWOTA8_2017110501.zip)
- Flash Update
A. Use Vol-Dn + USB Cable to boot into fastboot mode.
B. Use Replace_Recovery.bat in HWOTA8 to flash TWRP recovery.
C. Disconnect USB cable, use Vol-Up + Power to boot into TWRP.
D. Create "HWOTA8" directory in MTP sdcard.
E. Put hwota8_update.zip, MHA_RECOVERY8_NoCheck.img, and three huawei update package (update.zip, update_data_public.zip, and update_all_hw.zip) files into "HWOTA8" directory.
F. TWRP install sdcard hwota8_update.zip, it will reboot and install update automatically.
- Downgrade Nougat
A. Put update.zip, update_data_public.zip, and update_all_hw.zip files into HWOTA8 repack directory.
B. Run repack.bat to update zip files.
C. Go through "Flash Update" steps and use repacked zip files.
D. Enter recovery and do factory reset.
- Rebrand
A. Put Put hwota8_rebrand.zip and "OEMINFO.bin" (From HWOTA) into SDCard HWOTA8 directory.
B. Use Replace_Recovery.bat in HWOTA8 to flash TWRP recovery.
C. Disconnect USB cable, use Vol-Up + Power to boot into TWRP.
D. Install hwota8_rebrand.zip, it reboots and factory reset failure.
E. Enter fastboot mode and unlock device again.
F. Use Replace_Recovery.bat in HWOTA8 to flash TWRP recovery and enter it.
G. Do "Downgrade Nougat" steps to the rebrand firmware, it fails and reboot but fine.
H. When going to system press "Vol-Up" to enter eRecovery, do "Low-level format data partition".
I. Wait all done and recovery menu show up, reboot and do "Downgrade Nougat" again.
J. Update should be successful this time, rebrand done.
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