Possible to rewrite (FOSS) software on Prius Prime Multi Media Display?

It most likely runs "Automotive Grade Linux" which has security features to prevent "unauthorized" changes. Probably not possible to do anything. Secure Boot - AGL Documentation

 

never say never...

 

I'm sure it's possible ! Just thinking about it hertz !
extracting the main image, where ever it is, ECU perhaps?
than extracting the images for the other ? ECMs how ever many there are in each different model.
Than parsing the code in whatever programming language(s) are used. And understanding how messages are sent and received on the buses, converting protocols at junctions.
Knowing the crypto, security and magic num / hash types while remembering what the open source various licenses permit and restrict.
Sounds like a fun project for an individual or a small team of exceptional programmers with a large following of users.
Ever edit (without explicit instructions ) or even look at a binary ?

 

Done plenty of that ... just not so much on cryptographically signed ones I don't have the signing key for.

 

I just haven't taken mine out and since a tesla style replacement will go in there I'm not motivated. What id really need is pictures of the circuit boards. in my experience, serial or jtag gets you in to view and from there its like walking and breathing at the same time.

 

Hey if you're up for the adventure, enjoy !
My post was more about the Open Source issues embedded in the control functions if there are any. The open source licensing inclusions might only be for the entertainment features anyways. You know, cameras, usb, bt, radar, sonar, etc; all the good stuff ...
adding ai, vr, ar, xr gets expensive and can be very distracting for those not ready for it.