Flash firmware on General Mobile GM20
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How to flash General Mobile GM20?
Why reinstall the firmware?
Errors constantly appear in the Android OS.
Some applications stop opening.
Many programs from the Play Market do not start.
The phone restarts or shuts down for no reason.
The phone started to work slowly.
You are not satisfied with the possibilities of the stock firmware.
Where can I find the firmware?
On the official Internet resource of the phone manufacturer.
On specialized services where users post custom or official OS.
What should be done before installing the firmware?
Create a backup copy of user data and transfer it to another medium.
Insert SD card. An SD card is needed to write firmware to it.
Determine your smartphone model.
Charge your phone fully.
Find and download the archive with Firmware.
Installing TWRP Recovery
Download the Official TWRP App from the Play Market. Download, install and launch the application..
When you start the application for the first time, you must agree to install the firmware, as well as agree to grant the application Superuser rights and click the 'OK' button.
After moving to the next screen, select the 'TWRP FLASH' item and provide the application with root rights.
On the main screen of the application, click 'Select Device', and select your phone model.
After selecting the phone, the application will redirect the user to a web page to download the modified recovery environment image file. Download the proposed *.img file.
When the file is loaded, you need to return to the main screen of the Official TWRP App and press the 'Select a file to flash' button. Select the file downloaded in the previous step.
Press the 'FLASH TO RECOVERY' button and confirm that you are ready to start the procedure - press 'OK' in the question window.
When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure is now complete.
Copy the required files to the memory card. Using a PC or laptop card reader.
Insert a memory card into the device.
To reboot into recovery, you need to enter the menu accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. Select 'Reboot' and then click on the 'REBOOT RECOVERY' button.
Firmware via TWRP
Before flashing, you need to delete all user data from the phone, this will avoid many problems. press 'WIPE' on the home screen.
You can start flashing. Click the 'Install' button.
The file selection screen appears. At the very top is the 'Storage' button, select the location where the firmware file is located.
Select the storage to which the files were copied.
Find the file we need and click on it. A screen opens with a warning about possible negative consequences, as well as the item 'Zip signature verification'. This item should be checked by placing a cross in the check-box, which will avoid using damaged files when writing to the phone's memory sections.
The procedure for flashing the phone will begin, accompanied by the appearance of inscriptions in the log field and the movement of the progress bar.
After the firmware installation procedure is completed, the 'Successful' message appears on the screen.
Summary: OS: Android 10; Processor: MediaTek Helio A25 MT6762D; Processor clock: 1.80 GHz; Number of cores: 8; GPU: ARM Mali-T880 MP2; RAM: 4 GB; Internal memory: 64 GB; Memory cards: yes; microSD, microSDHC, microSDXC (up to 256 GB); Display: Color / IPS TFT; 16M colors, 60 Hz; 720 x 1560 px (6.09") 282 ppi; 79.8% screen-to-body ratio; Display protection: yes; Type: Standard; Photo matrix: 13 Mpx; Flash: yes LED; Digital zoom: yes; Video formats: H.264, H.265, MPEG4 - 30 fps; Additional: AF, f/1.8; Type: Portrait; Photo matrix: 8 Mpx; Flash: yes; Digital zoom: yes; Additional: FF, f/2.0; A-GPS: yes; GPS module: yes; Bluetooth: yes v5.0; EDGE: yes; GPRS: yes; IrDA: yes; NFC: yes; USB: yes v2.0 OTG; ...
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