You may lose specific hardware optimizations, such as the dedicated physical button shortcuts or FM radio. Prerequisites Before Flashing
Some GSIs don't sleep properly. Check the "CPU Deep Sleep" settings in your ROM's developer options. qin f21 pro rom
Usually caused by not wiping data after flashing. You may lose specific hardware optimizations, such as
This is critical. The NVRAM contains your IMEI and network data. If you lose this, your phone won't connect to cell towers. You may lose specific hardware optimizations
Most F21 Pro units arrive locked. You will need a specialized tool (like MTK Client) to bypass this. MTK Drivers: Installed on a Windows PC.
The stock firmware (especially the Chinese version) is designed for extreme minimalism or parental control. By switching to a custom ROM, you gain: