$0312 Sub Function Not Supported or Invalid Format ($12)

[ccclose]

Previous tuner loaded custom tunes to truck, now I am trying to adjust tunes and i am coming up with this error

"$0312 Sub Function Not Supported or Invalid Format ($12)":wallbash::wallbash:

Is this a result of previous tuner locking the tune?


V3
Firmware V3.00.070
Bootblock V3.00.005

V8
Version 8.38

here is trace file 23959

[GMPX]

Your ECM has a CSP5 Custom OS in it, reading will be blocked unfortunately for you.

[ccclose]

So answer is dealer flash?

Or is there another way, such as someone sending me the correct file.

ECM Shows E/C S90170.02

[GMPX]

You should be fine to flash over the top once you get a suitable file (provided you are happy to lose the tune in there forever?)

[ccclose]

I see, I’ll see if I can come up with a stock file.

I believe I may run a single tune and adjust accordingly so I don’t run into this issue again.

Thanks!