Extracting signed firmware image

[JohnieBraaf]

Hi,

I'm attempting to extract the latest firmware update .sig image using dji-firmware-tools/dji_imah_fwsig.py
I cannot seem to get it done with any of the known decryption keys. Has anyone managed to do so?

Cheers

 

[quaddamage]

You are trying to decrypt Movidius file using tools for DJI format?

I don't think the key is the only reason for your issues.

You need to get MDK (not the old game, the one from Movidius), and reverse engineer it.

See this comment:

Problems with firmware update

Ok so I purchased a second hand Tello the other day. Flew it for a couple of times and then decided to update the firmware. Wow that was a mistake! Now it is completely obsolete. I downloaded the firmware on my iPhone (don't have an Android before you ask) and now when trying to connect the...

tellopilots.com

 

[JohnieBraaf]

Aah, thnx for clarifying. I guess my expectation of an underlying android/linux like filesystem with readable scripts and binaries inside of the image was wrong.
I'm new to Movidius, so I think reverse engoneering will be raising the bar a bit too high for myself.

 

[quaddamage]

The manuals I got say that mvcmd (`MA2x`) file is generated from ELF. So no filesystem, only one big binary.