PM me a copy of the bin file you initially read from the PCM. I would say post it here but an unsupported OS isn't one we need in this thread.

Two things....

1) The XDF and the OS number MUST MATCH. Even if the OS is 1 digit off it won't work. Unless an XDF is labeled that it supports multiple OS's it will only work CORRECTLY with the OS...

OS 12587603 for a 2004 Silverado with a 5.3(LM7) setup for a manual transmission. If you plan to run flex fuel then you would want an L59 engine segment rather then the LM7. You will need to readjust...

With out knowing more about how you flashed the file I'm not going to say this will 100% work but it's very unlikely either of the PCM's are actually bricked unless you altered something in the boot...

I have not seen an XDF for that OS and do not know of anyone working on one for it. Your only real option will be changing the OS to the supported 12587603 and then finding a bin file for a similar...

You will need a matching COS to use one of those XDF's. They will not work with a stock BIN file.

Since COS's from tools like HPT and EFI Live do not contain any type of calibration data you...

What OS number are you wanting to use? I might have a trans segment that would work for you.

The 512K Xdf's are OS dependent. If you have a supported OS on an 0896 there is no reason it won't work. It is a 0411 for all purposes.

Thank you for all the work you've put into these, I know how much time they take to create.

I can't wait to see where this leads us now that open source flashing is now possible.