Flashing Different OS's
1. P01: 09354896 can be flashed to a later 01+ P01 tune fine (12200411). But flashing a 0411 to a 09354896 will cause it to be corrupted.
2. P59: No issues flashing between any year of the blue/green connector PCM's
3. E38:
2006-2007 E38 (service numbers 12597121 & 19210738)
2008 E38 (service numbers 19418222 & 12612384)
2009 E38 (service numbers 19418223 & 12625455)
** Early 2009 G8 GT with the 6.0L uses a 2008 (12612384) Late 2009 uses the (12625455)
2010+ E38 (service numbers 19418221 & 12633238)
** 2010 2500HD trucks with the LY6 still used a 2009 (12625455) E38 ECM
***If you're locked out of an E38 following an attempt to reflash a different year's OS—for instance, flashing a 2010 OS onto a 2007 E38—common keys to try are 3F80, 43D4, or simply mirroring the seed. These solutions may save you from resorting to a time-consuming brute force attack or an ECM replacement.***
4. P12: 2004 2005 2006
5. P12a: 2007
6. P04: No issues flashing between any year
7. E67:
19210737 2006 – 2011+ The King. GM sold this to replace almost all 2006–2009 E67s. If you find one, grab it. It works for almost everything.
12633264 2009 – 2015 The "High Performance" standard. Used on LSA CTS-Vs and ZR1s. Excellent for any 2010+ application.
12678513 2009 – 2015 The modern replacement for the 12633264.
12612384 2006 – 2008 The final version of the "Early" hardware. Found in 2008 TBSS/Envoy.
12607096 2006 – 2008 Very common 2007 GL/CTS/Impala ECM.
12605843 2006 – 2008 Common 2007 number.
12603530 2006 – 2008 The most common "Early" ECM. Used in first-gen CTS-V and 2006 LS4 cars.
12590032 2006 – 2007 Very early production. Avoid using for 2008 models if possible.
12602044 2006 – 2007 Early production.
12636659 2009 – 2012 Common in 2009-2012 Colorado/Canyon/Hummer H3.
12630457 2009 – 2010 Transition year unit. Found in 2009 CTS-V and some trucks.
12651994 2012 – 2014 Found in later model specialized applications.
12625453 2009 Only Rare 1-year only number often found in 2009 XLR-V or STS-V. Avoid if possible.