RomRaider

Using a HEX editor I compared a few ROMs from about the same year and noted some of the common labels and their address.

Does anyone know what "12345" or "DABCDNODE" are used for or signify?
For theses 3 ECUs, they are in the same location, which must mean something...

First 0x8200 bytes within CAN-based ROMs are kinda bootloader and seem to stay the same for most of ROMs within family. There are some areas in it which store the FW upgrade/reflash history details or initial ROM IDs - saw them updated after reflash via commercial tool with ECUID and some other piece of data in small pieces (100..200 bytes). So no surprises if they are close to each other for your ROMs.

Interesting... thanks for sharing your knowledge on this.

Just for fun, I compared a 2012 Infiniti FX37 (3EV1A) to a 2017 Nissan 370z (6GE2C) since they use the same engine, the wonderful VQ37VHR. All but 1-2 bytes were the same in the first 0x8200 bytes, just like you said

The rest of the ROM didn't match up very often. I would have thought the same engine would have similar code, but I guess all it takes is a single table to be a little longer and everything is shifted by a byte or more.

Can you share your rom dump code or at a minimum the algorithm?

(posted in another thread, but may also be helpful here)

Quick Update:
The program seems to work well. I have dumped 5 different G37 ECUs and a 2010 Altima.
The ROMs look to be valid, based on the location of the usual text. (LOADER80, DATABASE, SH705927N, DABCDODE, ECU ID and NHU)

I tried to dump a 2017 Maxima and it didn't work. I made a small change to the code and haven't been able to retest it. My buddy sold his Maxima.

I do expect it to work on other Nissan/Infiniti vehicles, but more testing needs to be done.

One Caution:
Due to the speed of dumping the ECU (5 minutes), the other CAN modules don't see the ECU and most of them set CAN bus communication error code(s). I use OBDFusion with the enhanced diagnostic add-on to clear the codes and everything is back to normal.

In the next week, I will post a link to motorvateDIY's github, where schematics and code will be posted.
I hope others will be able to test and we can find out more about the 2008+ ECUs.