"FEL" stands for "Force Entry into Bootloader" and it is a method used to enter the bootloader mode of certain electronic devices, such as Android devices or embedded systems.
The bootloader is a small program that runs on a device when it is first turned on, and it is responsible for loading the operating system or other firmware onto the device's memory. The bootloader can also be used to update the firmware or perform other maintenance tasks on the device.
To enter the bootloader mode, the device may need to be in a specific state or have a certain configuration. FEL is a method that can be used to force the device into the bootloader mode even if it is not in the normal boot state.
For example, to enter the FEL mode on some Android devices, you may need to hold down a combination of buttons while the device is powered off and then connect it to a computer using a special USB cable. Once the device enters FEL mode, it can be programmed or updated using specialized software tools.