Could you have loaded an incorrect firmware? Perhaps a cure firmware would help if this device can reach pre-boot mode.
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[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]
If you need more help post again stating clearly what you did previously. To me your post indicates that you first upgraded the unit software and then attempted some other software loading via SD card. State how you did both [or was it only one?] i.e. if you used update.exe in pre-boot to load an rgn file, or load a gupdate.gcd via a Garmin folder in SD, or if you used text commands via SD.
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