APM Bootloaders for APM2.x February 8, 2020February 8, 2020 dronecode 0 Comments Bootloader for APM2.x autopilot series Bootloader for: 32u2 MCUBootloader for: 2560 MCU You need AVR programmer with ISP connector to burn these boot loaders. See the 4 and 10. Use AVR programmer to upload bootloader.