The following steps show you how to use backdoor boot loader to download FW to CC2650 LaunchPad:
1. Connect CC2650 LaunchPad DIO11 to GND.
2. Press "RESET" button on CC2650 LaunchPad to restart CC2650 LaunchPad.
3. Select FW and download it to CC2650. You would get the following error
and "Failed" on Flash Programmer2 but it actually program and verify