Which coustom OS do I need to use to go 2bar

[lstruck]

I'm trying to go to a 2bar os. in the tutorial my OS is not listed so I'm not sure which one I need to use.
currently 12606960 OS. Any help on the COS I need to use to go to a 2 bar would be greatly appreciated. this is on an 04 returnless fuel rail silverado. thanks in advance.

[joecar]

You will need to first change to an OS that is listed (copy all your tables over, a little tedious but doable).

[lstruck]

mine is not listed?

GM Stock Operating System
EFILive Custom Operating System
2001
12202088
012500xx
92111922
012500xx
12208322
012700xx
12225074
012900xx
2002
12209203
020100xx
12212156
020200xx
12221588
020300xx
12593358
020400xx
2003
12585318
031100xx
12577216
031300xx
12579405
031500xx
12585318
031700xx
12593058
031900xx
2004
12509967
040300xx
12583506
040800xx
12587604
041100xx
12588804
041200xx
12591347
041300xx
12592433
041400xx
12585950
040729xx
12587603
040730xx
12592425
040731xx
2005
12592618
051200xx
12593555
051300xx

[lstruck]

okay to flash any of the o4 os first.
then read it
copy all tables and flash again correct.

[joecar]

Yes, make sure that it runs ok on the 2004 OS that you flash in (after copying all tables that are different)...

I'm not sure how DBW is affected, but you will have to check the operation of this.

[lstruck]

I opened a copy but it will not let me flash it?

[joecar]

I opened a copy but it will not let me flash it?

Did you attempt a full-flash...?

If so, then the file is not compatible with the PCM.

[lstruck]

how can I open two tuning files at the same time to copy and paste or do i have to open one copy close it then open the other then paste?

[joecar]

You can open two instances of the tunetool (one on your old file, the other on your new file), then for each table do copy-with-labels from old, and paste-with-labels into new...

do this only after you know that the new OS is going to be compatible/flashable with your PCM.

[lstruck]

Okay this is what I did I had a friends tune that was on the list. So I put his the matching 2 bar 0S on my pcm. Then I flashed his calibration on to it. Then read the calibration on his and i'm copying and pasting but not the labels? and I didn't find this
:
{B4206} Use 02 With Open Loop Commanded Fuel Table (enabled on my tune but not available on the new OS).