mine fenix 5x plus is on 17.10 firmware. Try to backdate firmware rename it to gupdate.gcd and put under Garmin folder it does not seem to update at all and the file just got deleted after.
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mine fenix 5x plus is on 17.10 firmware. Try to backdate firmware rename it to gupdate.gcd and put under Garmin folder it does not seem to update at all and the file just got deleted after.