here you go
How do you check cable for firmware?
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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Plug cable into obd port or bench powerset click tools then check firmware version
Actually I used the terminal utility on the AVT site and queried it using instructions in manual.
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