Use a python-based tool like mtk-client to force the device into BROM mode (usually by holding the "heart" or "back" key while plugging it in) and unlocking it.
This guide covers everything you need to know about finding, choosing, and installing a Qin F21 Pro ROM. Why Install a Custom ROM on the Qin F21 Pro? qin f21 pro rom
There are two main "flavors" of ROMs available for this device: 1. Global/Multi-Language Cracked ROMs Use a python-based tool like mtk-client to force
Since the F21 Pro supports Project Treble, you can technically run "clean" Android versions like LineageOS or Pixel Experience. Cleanest Android interface possible. There are two main "flavors" of ROMs available
These are modified versions of the stock firmware. Developers have "cracked" them to include Google Play Services and remove the digital wellbeing restrictions. These are generally the most stable and keep the original T9 keyboard functionality perfectly intact. 2. Generic System Images (GSI)
Better localized translations than the stock OS.