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Thread: Go back to original operating system?

  1. #1
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    Default Go back to original operating system?

    How do you go back from a COS 3 to the original operating system? Do not have the tune file for the original operating system. Can i flash a tune with the original operating system then do a enigine and transmision segment swaps?


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  2. #2
    Joe (Moderator) joecar's Avatar
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    You can full flash the base OS, then do a cal-only flash from the latest COS file...

    e.g. 02020003 is based on 12212156.

  3. #3
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    Quote Originally Posted by bad boyz racing View Post
    How do you go back from a COS 3 to the original operating system? Do not have the tune file for the original operating system. Can i flash a tune with the original operating system then do a enigine and transmision segment swaps?
    Yes, I've done it before when people went back to mostly stock. Just find a tune file with the needed os, perform a full os flash it in of the gm system, then do a same os trans segment swap and your golden.
    LQ4, Pro-Flo, heads, Stock48 cam'd, twin TO4E 2001 C5 830rwhp/905rwtq
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  4. #4
    Joe (Moderator) joecar's Avatar
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    You can full flash a base tune having the same transmission...

    or you can full flash a base tune with a different transmission and then do the transmission segment swap...


    you will still have to do a cal-only flash from the COS file to get the modified tables into the stock tune (and you then also have to edit B3605 back to stock).

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    I have loaded COS5 successfully but now I want to revert back to the original 12212156 OS. But when I load my last tune file (the one with 12212156) the option to flash PCM and OS is grayed out. I have the commercial scan & tune version.

  6. #6
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    Plug your FlashScan into your laptop prior to opening any tune file, then you will have the full flash option available. If you have a V2, Id suggest using V8 to flash.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
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    Quote Originally Posted by ScarabEpic22 View Post
    Plug your FlashScan into your laptop prior to opening any tune file, then you will have the full flash option available. If you have a V2, Id suggest using V8 to flash.
    That worked, thanks!!!!

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    Quote Originally Posted by tinindian View Post
    That worked, thanks!!!!
    Sure thing.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

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    If I full flash back to the original OS ( I have the original file saved) can I full flash back to the COS later if I want to do so ?? Please reply as anyone has the time :-)
    LBL866

  10. #10
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    Yes, absolutely no reason you cannot, as long as the base OS is correct.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

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