If you previously enabled (rare on Lumia 650):
Open Command Prompt as Admin and run:
.hex file): This is the programmer file that tells the CPU how to talk to the flash memory via UART or USB.0_gpt.bin): This rebuilds the map of where the OS, modem, and UEFI live on the eMMC storage..ede or .emmc files): These contain the bootloaders, the Windows Boot Manager, and the recovery environment.