Can I change my 3 bar SD OS back to a STOCK FILE?

[rel3rd]

If I do NOT have my STOCK, FACTORY tune, can I simply find a STOCK FILE in the repository, and do a WRITE ENTIRE?

The end goal is to convert to a FLEX FUEL OS, but I currently already have a 3 bar custom OS.

Will I need a different, new, PCM, or can I OVERWRITE what I have, and simply START OVER?

[SultanHassanMasTuning]

you will need your original file and write entire, you can not reverse the enhanced tune

[rel3rd]

you will need your original file and write entire, you can not reverse the enhanced tune

I do not have the original file.
3 bar OS upgrade was done several years ago by unknown party.

If I am understanding, I cannot simply take a generic factory stock 2002 Silverado file and Write Entire over my current tune and start over from there?

[SultanHassanMasTuning]

on the older PCMS yes you can

make sure the OS is matching your current and you can overwrite

[jaydubb71]

I do not have the original file.
3 bar OS upgrade was done several years ago by unknown party.

If I am understanding, I cannot simply take a generic factory stock 2002 Silverado file and Write Entire over my current tune and start over from there?

You can try BUT you will need to spend credits to do that. I did find one with Flex Capability. OS number is 12216125 and its for a P01.

[BrianPeppers]

You can Write Entire, but it will also write the new VIN/ vehicle, which you'll likely need to spend 2 credits to 'unlock' your 'new' PCM.

[rel3rd]

You can try BUT you will need to spend credits to do that. I did find one with Flex Capability. OS number is 12216125 and its for a P01.

You can Write Entire, but it will also write the new VIN/ vehicle, which you'll likely need to spend 2 credits to 'unlock' your 'new' PCM.

I have unlimited model year 2002 Silverado credits, and all three OS "tunes" are 2002, then I shouldn't have to buy any credits, should I?

Current OS (in the car now), Stock OS (I was going to use to flash back to "stock"), and Flex Fuel OS are all three 2002 Silverado.

My VIN is already mismatched from whomever originally did the 3 bar COS. Luckily it's not an issue for me for emissions or anything.

[jaydubb71]

Cool. Try that OS I found...

[BrianPeppers]

With unlimited model year you shouldn't have a problem then.

[rel3rd]

Awesome. Thanks for the replies everyone.

[rel3rd]

Just to update...

As stated, I have unlimited 2002 Silverado credits for HPTuners

Did a "Write Entire" from my existing 3 bar SD OS (12212156 > 1261002)...
back to a STOCK TUNE 12212156 OS

Never even tried to start the car...

Then, did another "Write Entire" to an already Flex Fuel adapted (spark and fuel) 12216125 2 bar SD OS

Just need to get the FF sensor plumbed and wired up.

I didn't NEED a 2 bar SD OS, but that's the only one I could find that was an easy swap, already had the flex fuel tables in the tune, AND didn't cost me any extra credits.

I'm just happy I didn't BRICK the PCM, LOL

Get a little (read:LOT) nervous when that BRICKABLE label pops up...lol

[rel3rd]

Cool. Try that OS I found...

I think I used the same one that you found, a 2002 Silverado with 6.0/4L80E, and flex fuel adapted already...but it now appears to be gone?

Are you still able to see it in the repository?