howto:pyduml [dji.retroroms.info]

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====== DJI Flashing & Rooting FAQ ======

Flashing your DJI aircraft is bloody simple with the pyduml.py script. This FAQ is based on work by vk2fro, and Dreadwing007.


===== 1. Toolchain =====
Install your toolchain as per the instructions [[.:toolchain|here]]. You only need to do this once... but check the instructions to see if there are any new tools that you may need.

===== 2. Get the duml magic =====
If this is your first time using duml, you will need to checkout the code from git.  

  cd ~/Documents/
  git clone https://github.com/hdnes/pyduml.git
  cd pyduml

If you have done this before and you want to make sure you have the latest code, you just need to sync to the most recent version

  cd ~/Documents/pyduml
  git pull


===== 3. Get some firmware =====
If you are planning to flash new firmware, you obviously need some firmware files. The primary source is http://github.com/MAVProxyUser/dji_system.bin ... or, you can go to [[.:firmware]] for a listing of what is available

**NOTE for Spark RC**: Firmware for Spark RC have the ending ".tar" as the Spark RC is quite different from the other devices (also how to flash, see below, skip to bottom of (4.) to see next Spark RC note...)
===== 4. Identify the port for the USB link to your aircraft =====
This step will find the TTY for connectivity to your aircraft, and store it in a file /tmp/dji.port for use later.

  * Power on your aircraft
  * Connect USB from your computer to your aircraft
  * If you're using windows, check in device manager for the port (assistant 2 must be installed for drivers) then skip to step 5.
  * Open a terminal window

<code>
  ls /dev/tty* | sed -e "s#.*/##g" > /tmp/dji.on
</code>
  * Disconnect the USB cable
<code>
  ls /dev/tty* | sed -e "s#.*/##g" > /tmp/dji.off
</code>
  * Now find what is our tty port for the aircraft
<code>
  diff /tmp/dji.on /tmp/dji.off | grep "<" | sed -e "s/.* //" > /tmp/dji.port
  rm /tmp/dji.on /tmp/dji.off
  cat /tmp/dji.port
</code>

**NOTE for Spark RC**: Please skip above and just switch on RC and connect your Mac/PC to its WiFi network as a preparation. Also see notes for Spark RC in section (5.) 
===== 5. Flashing =====
FULLY CHARGE A BATTERY!!! do not try to flash with a depleted battery - itʼll only end in tears and a dead aircraft. If you aren't interested in changing firmware and you just want to get root access, skip ahead to the next step.

  * Put the firmware into the same folder as pyduml.py - ~/Documents/pyduml

  * Open a terminal window/command prompt and go to our directory

<code>
  cd ~/Documents/pyduml
</code>
  * Prepare our package for delivery - Rename the firmware
<code>
  cp <yourfirmwarename> dji_system.bin
</code>
**NOTE for Spark RC**:
<code>
  #ONLY do this if flashing a Spark RC
  cp <yourSparkRCfirmwarename.tar> fw.tar
</code>
  * For example...
<code>
  cp V01.03.0700_Mavic_dji_system.bin dji_system.bin
</code>
If your on windows substitute 'copy' for 'cp'
<code>
  copy V01.03.0700_Mavic_dji_system.bin dji_system.bin
</code>
  * Deliver the package
<code>
  python pyduml.py /dev/`cat /tmp/dji.port`
</code>  
**NOTE for Spark RC**: No additional Parameters needed, just choose the Spark RC as device when prompted...
<code>
  #ONLY do this if flashing a Spark RC
  python pyduml.py
</code>  
For windows users:
  python pyduml.py com#:
where # is the comport number you discovered in device manager.

Flashing takes around 10 minutes. Watch the lights on the aircraft. It may reboot during the procedure but donʼt touch it. Once it chimes and the front beacons stop flashing, its done. Be patient - 10 minutes seems like an awfully long time, but you donʼt get a pretty progress bar like when you flash with assistant.

Do not disconnect the drone when the script says its finished - thats only the upload portion! The flashing process follows and its a good idea to leave it all alone until you hear the chimes.

Want to watch the process? if you have root, you can issue the following commands in a second terminal session:
  * monitor progress with terminal if you already have root:
<code>
  adb shell
  busybox tail -f /ftp/upgrade/dji/log/upgrade00.log
</code>
  * Remove temporary file from the firmware upload that we created before
<code>
  rm dji_system.bin
</code> 
Windows users can simply del the file
<code>
  del dji_system.bin
</code>

The optional batteries then can upgraded/downgraded simply by inserting them in the aircraft and connecting to the Assistant, letting it detect and fix any discrepancy in the versions.
===== 6. Rooting =====
  * Prepare our package for delivery

  cp fireworks.tar dji_system.bin
Windows users:
<code>
  copy fireworks.tar dji_system.bin
</code>  
  * Deliver the package
<code>
   python pyduml.py /dev/`cat /tmp/dji.port`
</code>
Windows users:
  python pyduml.py com#:

  * Remove temporary file

  rm dji_system.bin

windows users:
  del dji_system.bin

===== 7. Open a shell =====
From your terminal window
  * List adb devices. You should see **RedHerring has Fangs!**

  adb devices

  * Connect to your aircraft via ADB

  adb shell

===== 8. Make ADB persistent =====
To make it easier to get back into your aircraft via ADB next time, you can add a command to the boot init script. Beware. This command is modifying a startup script. If you get it wrong, that could be ... well ... bad. Don't do this more than once, unless you change your firmware to re-patch the startup script.

  mount -o remount,rw /system
  echo /system/bin/adb_en.sh >> /system/bin/start_dji_system.sh
  reboot
===== Credits =====
  * This FAQ was compiled based on work by vk2fro, and Dreadwing007.
  * Of course, we have to thank hdnes for his work, and hostile for all of his work too, not to mention the_lord for all his help as well. hdnes is also our hero for helping out and getting pyduml to work. Not to mention darkwing007 who collaborated with vk2fro to get the linux portion working.
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