1- Perform a "temp root" on the device.
2- Unlock the bootloader.
3- Enter Fastboot mode and perform a full flash of an "ENG ROM." If you encounter a "modem" error during the flash, uncheck the modem-related boxes; once the initial flash is complete, flash only the modem files separately—the device will then boot up.
4- Back up your data and perform the hardware "resistor modification" (resistor mod) on the device.
5- Perform a dual-SIM repair on the device.
6- Download the latest Global versions of HyperOS 3 and HyperOS 2. Extract both packages into folders. Delete the modem file from the HyperOS 3 folder, then copy the modem file from the HyperOS 2 folder into the HyperOS 3 folder.
7- Put the device into Fastboot mode and flash the (modified) Global firmware.
8- Do not perform any system updates, as this will cause the device to fall into an "nvdata" error state.
Note: For Chinese-market devices, I recommend registering only SIM 1 after completing the resistor modification.
2- Unlock the bootloader.
3- Enter Fastboot mode and perform a full flash of an "ENG ROM." If you encounter a "modem" error during the flash, uncheck the modem-related boxes; once the initial flash is complete, flash only the modem files separately—the device will then boot up.
4- Back up your data and perform the hardware "resistor modification" (resistor mod) on the device.
5- Perform a dual-SIM repair on the device.
6- Download the latest Global versions of HyperOS 3 and HyperOS 2. Extract both packages into folders. Delete the modem file from the HyperOS 3 folder, then copy the modem file from the HyperOS 2 folder into the HyperOS 3 folder.
7- Put the device into Fastboot mode and flash the (modified) Global firmware.
8- Do not perform any system updates, as this will cause the device to fall into an "nvdata" error state.
Note: For Chinese-market devices, I recommend registering only SIM 1 after completing the resistor modification.
