RomRaider

I am trying to downgrade my friends ecu for doing ghostcams and the decel burble
and noticed that it doesn't show those maps for the software version 0110c6.
So downgrading is the only option there.
Do i have to use JMGarageFlasher to downgrade or can i use mss5x flasher?
I did the full read without boot mode and my understanding is you need boot mode to do the read/writes.

Any help would be appreciated.

For full read you don’t need to put the dme into boot mode as you’ve noticed, you will however have to be in bootmode to change software versions.

Do you have the most current romraider definition file? I was thinking the c6 maps you would need to change were all defined in the most current def file.

Edit: Also you can do it with the mss flash tool. No need to use jmgflasher.

And this is the latest definition which has the maps you need for c6:
MS42 ECU Definitions v0.35 beta1.xml

I would not downgrade the SW if it's not absolutely mandatory. It can lead to all sorts of problems. Not always but can. And if you are newbie, it can be time consuming to get the ecu working again.

What are the important differencies between AD and C6?

No idea In practice I have not seen any difference between C6 and AD while driving the car. In the maps itself only difference seems to be the e-thermostat maps which have less cells in CA and C6 compared to AD.

So it would actually be good to revert back to AD?

I don't see any benefit in that. The definitions for ca and c6 are well enough shape for quite extensive tuning. And if some are missing, but known for AD those are easy to add
Maybe only in case of ews delete because ews delete for AD is the only one that is currently available "public".

But only for one HW version unfortunately... All MS42 ECUs I was working on were incompatible with that solution.

Depends, i have satisfied customers with all different versions, but some work and some don´t. Only 0110AD works all the time.

I am talking about the only solution which you can get for free - the one based on 0110AD. Unfortunately this one works only on 5WK90329 ECUs while most ECUs I have been working on were 5WK9031 which are semi bricked if you flash them with that dump.

Interesting, haven´t heard nor thought about that.

Tried flashing in bootmode and also using MSS5x flasher and all I got was semi-bricked ECU which had issues even when tried to connect to it using INPA on the bench. When I managed to connect and tried to read identification it was showing ....... as software number and also some random data as analog values. I do believe published solution is only valid for E39 (and maybe E38) but not for E36 ECUs (at least for european cars). I never had any issues downgrading (or just changing) software version in bootmode so it is not connected to switching software.

E36 never got MS42!

I´ve had some problems with non working ews delete in the past myself, haven´t thought about difference in ecu. I´ll try to source some other ecus to compare. Maybe MS42 is just not interchangeable like MS43.

Yeah I too haven't checked the hardware versions. But I have had few units that refused to work with AD software. They did run but no MAF signal and error code 170. I just thought that I f*** up something and upgraded to C6 which solved everything. Upgrading AD to newer ones has worked every time but downgrading not every time. Which is the main reason I started doing definitions for C6 and CA versions.

But as I said. Now when the definitions for other versions are very usable, don't change the sw version unless it is mandatory. It saves you from lot of potential problems.

Maybe he means Z3 (E36/7 and e36/8)