L31 OS Change

[SkinnyPedal]

I know I have don't it before but now I get a message saying I have 2 different OS's. Anyway to flash a new OS now on the L31?

[Taz]

L31 5.7L used the Blackbox Vortec PCM from 1996 to 2000 - believe these are cal flash only (i.e cannot change the OS) with EFILive.

The 2001 and 2002 L31 used an LS1-B PCM - so you should have no problem changing the OS with one of these.