If the phone fails with “Software install failed,” the firmware is incompatible. You may need to use the Hisuite Proxy method (advanced) to bypass version checks.
: To enter Fastboot mode for recovery tools, power off the phone, hold Volume Down , and connect it to your PC. Mar-lx1a Downgrade Firmware
Open HiSuite Proxy and paste the URLs for the , CUST , and PRELOAD packages. Tick the Force Auth Bridge box. Flashing : Click Setup in the Proxy tool. If the phone fails with “Software install failed,”
You must match the CUST and Base version. For example: power off the phone