For JCV you must create folder JCV in .System folder or in Garmin folder and add .jcv file inside. ( example: .System/JCV/ your jcv file )
Change your original gupdate.gcd to 108301000620.rgn and flash in pre boot if updater write that no new update available then just rename 108301000620.rgn to 097201000620.rgn
p.s.
I think that JCV will only work if we have original logo from dnx and then changed number to D1340-50, but maybe i am wrong.
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