Catymag, this is what I did:
• I have file extension enable and the only file on the SD card is “gmapsupp.img”
• I checked if the map with gmaptool and apparently it isn’t locked, or it does not say it were I am checking (this is a part of the display):
File: H:/Map/gmapsupp.img, length 1865711616
Header: 16.12.2012 23:23:05, DSKIMG, XOR 00, V 0.00, Ms 1, 000-00000-00
Mapset: INNSBRUCK, OSTERREICH, KLAGENFURT AM WORTHERSEE, O
fat: 1000h - 1200h - 38000h, block 32768
maps: 300, sub-files 301

Sub-file fat length
00002779 MD2 1200h 9952876
date 00.01.1900 00:00:00
00002779 MDR 1600h 169782224
00002779 SRT 4200h 981
00002779 TRF 4400h 31269891
I0000ADB TYP 4C00h 6552909
I10FDE29 GMP 4E00h 5415938
GMP: TRE RGN LBL NET NOD
map 10fde29 (17817129)
PID 1, FID 2779, region 1,5
PID 1, FID 2779, region 1,15
PID 1, FID 2779, region 1,20
PID 1, FID 2779, region 1,21
date 24.09.2012 19:52:41
priority 30, parameters 1 3 17 13
levels [17,18,19,21,23], zoom [84,83,2,1,0]
N: 56.250000, S: 54.749937, W: 9.249973, E: 10.130510
City Navigator Europe Denmark Q2/12
Copyright 1995-2012 by GARMIN Corporation.
CP 1252, Western European Corrected

• I tied renaming the file from “gmapsupp.img” to “CNEU.img”, but didn't work