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Parrot-Bebop2-Custom Firmware

Downgrading of Bebop 2 Firmware:

Why Downgrade? Versions 4.1+ have issues with take-off. Bebop 2 experiences about 120-180 degree yaw on take-off. If you have version 4.0.6, please skip the downgrade procedure. As of firmware version 4.0.4, the downgrade procedure has changed.*

  1. Connect your host machine to Bebop 2 via Wifi.

  2. Download the recommended version 4.0.6 firmware from Google Drive or Git Repo.

Other versions of the firmware can be found here:
4.0.3, 4.0.4, 4.0.5, 4.0.6, 4.2.0, 4.2.1, 4.3.1, 4.4.0

Note that the firmwares are named as follows bebop2_update_v_a_b_c.plf for version a.b.c. For eg., for version 4.0.6 the name of the file is bebop2_update_v_4_0_6.plf.

  1. Once the desired firmware is downloaded, a telnet client is required like (Putty or any FTP client like FileZilla). Alternatively on a linux machine, you can use a file manager like nautilus to copy the firmware to the Bebop. Now,
  • Turn on the Bebop and Connect to its WiFi network.
  • Press the power button 4 times in rapid succession on the Bebop 2. This activates the Telnet port.
  • Open a terminal and enter: telnet 192.168.42.1. You should see something like this:
BusyBox v1.25.0 (2017-06-29 09:25:56 CEST) built-in shell (ash)
Enter 'help' for a list of built-in commands.
/ #
  1. Type the following in the same terminal window:
mount -o remount, rw / &&
vi /bin/updater/dgwl.txt
  1. Now, you should see the contents of the file dgwl.txt:
# List of firmware versions to which to downgrade is allowed
# Regexps are basic regular expressions (BRE). See grep (1) manpage on a
# linux desktop to get the correct syntax (especially metacharacters escapes).
0 \ .0 \ .0
3 \ .3 \. [0-9] \ +

  • Press i to enter text entry mode in vi.

  • Type the version number of the firmware you downloaded in the last line:

# List of firmware versions to which to downgrade is allowed 
# Regexps are basic regular expressions (BRE). See grep (1) manpage on a 
# linux desktop to get the correct syntax (especially metacharacters escapes). 
0 \ .0 \ .0 
3 \ .3 \. [0-9] \ + 
4.0.6

  • Hit ESC key to exit the insert mode.

  • Save the file by typing

:wq
  • Hit ENTER
  1. Start nautilus or any other FTP client and connect to the server with the address 192.168.42.1 anonymously (No username and password). See the image below. Telnet-Nautilus
  2. Copy the downloaded firmware to /data/ftp/internal_000 folder of the Bebop 2 and rename the file to bebop2_update.plf.
  3. Go back to the telnet shell/terminal and enter:
/bin/updater/updater_scan.sh /data/ftp/internal_000
  1. Bebop should return the following:
[FIRMWARE UPDATER] Boot # 4: Scanning / data / ftp / internal_000 for updates ...
[FIRMWARE UPDATER] Boot # 4: searching PLF named files * .plf ...
[FIRMWARE UPDATER] Boot # 4: Testing /data/ftp/internal_000/bebop2_update.plf
[FIRMWARE UPDATER] Boot # 4: Checking the downgrading whitelist /bin/updater/dgwl.txt ...
[FIRMWARE UPDATER] Boot # 4: whitelist: # List of firmware versions to which to downgrade is allowed
# Regexps are basic regular expressions (BRE). See grep (1) manpage on a
# linux desktop to get the correct syntax (especially metacharacters escapes).
0 \ .0 \ .0
3 \ .3 \. [0-9] \ +
4.0.6
[FIRMWARE UPDATER] Boot # 4: search result: 4.0.6
[FIRMWARE UPDATER] Boot # 4: downgrading allowed by whitelist
[FIRMWARE UPDATER] Boot # 4: Sending
/data/ftp/internal_000/bebop2_update.plf to the Update partition
[FIRMWARE UPDATER] Boot # 4: Move command is <mv>
  1. And finally, reboot the Bebop 2 by entering reboot in the telnet terminal. Note: Bebop will reboot multiple times for the firmware upgrade/downgrade procedure. Check the version using FreeFlight Pro android/iOS app. It will ask you to update the firmware using the mobile application. DO NOT UPGRADE THE FIRMWARE using your phone.

Source: THE DIARY OF ICARUS23