No it's not the problem, that's the 'conventional' naming for an img file in a card, also the placement "x:\Garmin\gmapsupp.img" is universal for a media card in any Garmin device. If the original EUU img from Caty's post doesn't work when unlocked then it's likely the SD patching method isn't working properly for some reason.
You could try naming your present map 'anyname', e.g. 'CNNT_EUU_2016.30.img' and place it in a root folder named Map in the card, but it seems the unit is 'seeing' the present gmapsupp.img on the card when it's loading maps at boot but detecting it as locked even though it seems to be properly unlocked.
Let's know how you go with the new img. If that doesn't work i'll look for some problem with the SD paching pack.
While you're waiting for the map download to finish, if you want to try again with an RGN file i've made one for you from a patched GCD:
Spoiler:
Extract Updater.rar somewhere convenient such as your Desktop and open resultant Updater folder to find 194801000821.rgn and Updater.exe files. Follow the instructions in [Only registered and activated users can see links. ] precisely and be very quick once the unit details show up in the GUI because i suspect that your unit only stays in preboot for mere seconds, but once a flash has started it should then hold preboot. The very instant you see "nuvi 2689 [UID 3...." or similar in the window click 'OK' or hit the kb Enter key.
One more thing, i almost feel silly for asking, but you have been clearing nonvol memory before/after these flashings i hope. [Only registered and activated users can see links. ]. Unwanted things can remain in there otherwise.
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