python-adb/fastboot_protocol.txt at master · Halastra/python-adb · GitHub

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Fastboot Protocol Documentation

Fastboot's protocol is similar to ADB in only a few ways. However, to make the
code simpler to be inside a bootloader, it basically was completely altered.

Commands:
  getvar:%(variable)s
  download:%08x
  verify:%08x
  flash:%(partition)s
  erase:%(partition)s
  oem %(stuff)s
  boot
  continue
  reboot
  reboot-bootloader


Responses:
  These are 4-64 bytes long. The first 4 bytes is the header, the rest is
  header-specific but only up to 60 bytes.

  INFO + data[0-60]
    Arbitrary data returned from the bootloader.
  OKAY + reason[0-60]
    Last response, says the command succeeded.
  FAIL + reason[0-60]
    Last response, says the command failed.
  DATA + size[8]
    Only in response to a download command, says the bootloader is ready to
    accept `size` amount of data.