New here to HP Tuners and I was trying to read my ecm on my 02 4.3 V6 Blazer to play around with the software. I know at my ecm was replaced by a shop do to the factory one going out. When I try reading it with HP I get a "Request Download x7F Negative Response Code", from what I read around here is that the ecm my be locked. Im almost positive its never been tuned before but not sure if the shop had a handheld programmer on it to get it to work with my truck. Is that a way I can work around this?
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