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@tattooman
Reportedly according to [Only registered and activated users can see links. ] if you have V3.40 or earlier there is no problem with map sig when maps are unlocked with the latest gimunlock [0.03+MapSigPatch]. Try downgrading to v3.20 but first check in the current GarminDevice.xml that the previous attempt was in fact successful and it's now showing "SoftwareVersion>340</SoftwareVersion>" not "SoftwareVersion>430</SoftwareVersion>".
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Thread: Nuvi 66LM firmware rollback
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22nd April 2015, 12:49 AM #8Garmin/GPS Systems GMod.
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