Adam,
I don't think this locked ECM issue is related to the GPEC5 ECM.
I have a July 21 built Gladiator with the GPEC2A ECM and mine hasn't been able to be unlocked either for a tune.
And it was attempted by someone that had tuned earlier models of the Gladiator.
He said there were 'rolling codes' in the security on mine. Something that was not present previously.
So I am thinking the issue is a software upgrade more than the hardware.
PM me and I'll give you my phone number and we can talk further. As I want similar to you.
I am going to post on the US Gladiator forum and see if anyone can provide any more information too.
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