Same exact issues as spijun is having.
I tried too - no problem! (gmap3d.img of the CNEU NTU 2017.10 via gimgunlock-0.03+MapSigPatch)
Are you sure is the latest Gimgunlock+mapsigpatch version?
How is your Gmaptool log (details tab)?
Do you get cannot unlock map in nuvi with this .img?
Last version from your link
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My Nuvi 2757 - not support 3D, but 3D Need for Garmin StreetPilot 2.37
Created map with MapInstall and unlocked without problems with gimgunlock
Last edited by spijun; 10th April 2016 at 15:42.