- Flashtool
- Driver MTK usb
- Driver MTK vcom
- CDC Driver
- MT65xx USB Driver
- Firmware Polytron W7550 (CPU MTK)
- Download and extract the required FILEs above
- Install driver
- Open flashtool.exe inside the flashtool folder
- Click on Scatter-loading and select the scatter file MT6XXX_Android_scatter.txt inside the firmware folder
- Click Download / Firmware Upgrade (always try to upgrade firmware to prevent things that are not in want)
- Connect the phone to turn off while pressing Volume (+) / (-) simultaneously
- If out of Download Warning skip ignore and click Yes
- If the out of PMT text changed for the ROM, it must be downloaded means you must format the phone first in the format menu on flashtool. Choose Auto Format Flash and Format a whole flash except Bootloader and click Start / OK (this is at risk of removing imei on the phone DWYOR !!!)
- Wait until the process is 100% complete by marking green circle notification then unplug the cable
- Please try to turn on his phone and good luck .. :)
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