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  1. April 21st, 2020 #1
    dieselguy9311
    dieselguy9311 is offline
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    Default New operating system that does not seem to be supported.

    I have a operating system on a 2016 colorado that i just got recently that i can read from the ecm but can not edit. Will also not let me downgrade the os to an older system. Any help with the next step i should make would be much appreciated. os is 24000173
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