The files you are downloading are not under my control. You accept the risk of using them. If your device or module were to break or even catch fire, I do not hold any responsibility in any way. Therefore, proceed at your own risk!
Prerequisite: Ensure that you have the adb and fastboot tools installed on your system. If you are using Windows OS, also download the Google USB Drivers from here
Download the desired software version, including a dummy QCN file and the config file, from this MEGA folder
- Enter module shell using
adb shell - Type the command
flash_erase /dev/mtd16 0 0- this will erase the boot partition and force the module to boot directly into FASTBOOT Mode - Reboot it using command
reboot
After a few seconds, it should appear as Android ADB. On Windows, it may not be recognized out of the box. Point to the folder where you extracted Google USB Drivers and select Android Composite ADB Interface.
Check if the device is recognized by running the command fastboot devices. If it is recognized, proceed.
Now navigate to the folder where you downloaded the firmware (use CMD prompt on Windows or Terminal on *NIX OS) and run the following commands:
fastboot erase ZTERW
fastboot erase uefi
fastboot erase system
fastboot erase modem
fastboot flash uefi uefi.elf
fastboot flash modem NON-HLOS.ubi
fastboot flash boot sdxpoorwills-boot.img
fastboot flash system sdxpoorwills-sysfs.ubi
fastboot reboot
If everthing was fine, module should run with the new firmware
After swapping the firmware, using EFS Explorer, replace the config file in the EFS root with the one corresponding to the firmware you are running. This will update the exposed version in ATI commands and, in some cases, enable RJ-11 ports on modules that support only VoIP Mode.