Parrot-Bebop2-Custom Firmware

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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.
     / #
     

2. Type the following in the same terminal window:

   mount -o remount, rw / &&
   vi /bin/updater/dgwl.txt
   

3. 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
4. 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.
5. Copy the downloaded firmware to /data/ftp/internal_000 folder of the Bebop 2 and rename the file to bebop2_update.plf.
6. Go back to the telnet shell/terminal and enter:

   /bin/updater/updater_scan.sh /data/ftp/internal_000
   

7. 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>
   

8. 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