Got the CN Europe NTU 2013.40.gmapprom image, locked version downloaded with Jdownloader

Here's the latest system info:
Model: nuvi 3790
Software Version: 5.00
Audio Version: 2.40(British English-Emily)
Text Version: 2.90(British English)
GPS Firmware: 2.60
Bluetooth Firmware: 3.0.35 P55
PMIC Version: 824
TSC Version: 1.16

Cleared Nonvol using following method rather than pulling battery...
1. Viewing map Press Speed dial
2. Instuments view -> Long Press on Speedo dial
3. Navigate to -> Developer Info -> Nonvol Statistics -> Press top left icon (Clear Nonvol)
Note* After every firmware update it is always better to reset nuvi!

Also took dasilvarsa's advice & deleted all GPI files from the POI folder

Here's what's on the 16GB SDHC card!

CN Aus-NZ NT 2012.20 - 3D Buildings
CN Aus-NZ NT 2012.20
Europe Recreational v3
Great Britain Discoverer
Thailand Street Map 11
Thailand Street Map v11 NT 3D Buildings
Thailand StreetMap v11 NT DEM
Topo Australia & New Zealand v3

Looking round the forums I see there's allot of change & I'm thinking It's time for this old unit to get a re-vamp maybe 34xx firmware etc.

Has anyone produced an up to date file/folder description list?
I have this one but needs updating.....

•Diag folder - used by Garmin, it stores debug infos
•ExtData folder - ExtData folder - stores 006-D0952-01.bin, 006-D0952-02.bin, 006-D0952-03.bin, 006-D0952-04.bin, 006-D0952-05.bin, 006-D0952-06.bin, 006-D0952-07.bin, 006-D0952-08.bin files which contains special font for not alphabet languages likes Herbew, Thai, Arabic.
ExtData folder - also stores for some device with MTK chipset files ARC.BIN, BEE.BIN, 006-D1221-00.bin. 006-D1221-00.bin - GPS Chipset Type M HotFix Data software which updates by webupdater and ARC.BIN & BEE.BIN are files what stores current info for GPS software metioned above.
•GPX folder - stores your trip log. You can open the GPX files within this folder with Mapsource ( see post n 5 for more infos)
•BTM folder - stores infos about your phonebook and a .wav file your unit run when a call is coming in your phone.
•EULA folder - stores infos about licences (traffic,Navteq,nuRoute)
•Help folder - stores help files in different languages
•Keyboards folder - contains Keyboard languages files ( .kbd files)
•Reports folder - contains the mileage.csv , a file that will give you a summary of all of your trips, cost, etc. as part of the ecoRoute feature: it contains the following fields, Date (MM-DD-YYYY),Start Time,Origin Longitude,Origin Latitude,Destination Longitude,Destination Latitude,Origin,Destination,Distance (km), Time (min), Fuel Economy (l/100km), Fuel Cost (EUR), Carbon Footprint (kg).
Scores.bin is related to Overall : a combination of the speed acceleration and braking score and to Speed : gain points for driving at your vehicle's optimal speed for conserving fuel.
•RoadSideAssist folder - stores infos about RoadSideAssist services (AA) and images for 'Where Am I' function
•JCV folder - stores Junction View files on models which support such a feature
•ASR folder - "SRX+ASR"/Voice recognition files (Automatic Speech Recognition)
•G2S folder - G2S&.db :NüRoute technology&trafficTrends
•JPEG folder - stores Nuvi's default pictures and splash screens. You can add more jpg files into this folder
•POI folder - stores custom POI and travel guide files. These files are with .GPI extensions. It is ok to delete these files if you are sure you don't want them
•RemoteSW folder - Files stored in RemoteSW folder are the microcodes for appropriate chipset installed in your nuvi. Firmware upgrade checks at start if the version is to flash < version on disk - then upgrade it. It is an upgradeable code. (GCD, BIN & SUM) The first.GCD is the original firmware. The other file is the new firmware that the unit has installed-
•Scrn folder - stores your screen capture images. The files are in bitmap (BMP) format and could be opened with Windows Paint application
•Text folder - stores default and custom messages and keyboard layouts. These are text files with .GTT extensions. You can edit them with a text editor.Files with the text of the juice of additional languages.
•Vehicle folder - stores Garmin vehicle icons. Files are with .SRF extension. You can add and delete these files.
•userdata - technical archive, dont delete.
•Voice folder - stores Garmin voice guidance files. Files are with .VPM extension. You can delete unused voice files but do it with care.
•Birdseye folder - stores Garmin maps made by using BirdsEye Satellite Imagery in .jnx format
•Themes folder - stores .kmtf extension files. They are just text files, so you can create your own:you could change the color of lakes, parks, shopping centers and other polygon areas.
•SQLite folder - It stores .db files : Traffic trends, ecoRoute,myTrends and some user's strings. To read these files you can use a SQLite client .
•Logs folder - stores files concerning track logging feature.
•Demo folder - can store demo.gir file .It contains some images for the demo sequence.
•GPS folder - stores ARC.BIN , BEE.BIN etc files used by webupdater.
•Custom maps folder - stores custom maps made eg. with Google Earth in .kmz format
•Custom Symbols folder - stores waypoints symbols you can create and add in your outdoor gps
•Profiles folder - stores profiles and profiles settings in outdoor gps. You can choose different ones among automotive ,classic, marine etc each one with different settings: selected maps to be shown in choosen profile etc
•Filters folder - Geocache data
•Audible folder -audio books
•MP3 folder Mp3 audio files
•fs_image.ver -Technical file
•GarminDevice.xml - stores information about your Nuvi to facilitate transfer of data to/from your unit.
•gmapbmap.img - Garmin base map (worldwide map) cannot deselect it.
•gmapbmap.sum -check-sum file, mapupdate related, can be deleted.
•gmapoem.img -Additional map for specific branded units such as Honda and BMW,it doesn't show up in the map inventory, cannot deselect it.
•gmapprom.img - Garmin detailed map (preloaded). Back up this file before deleting or overwriting it.
•gmapprom1.img -Another Garmin pre-programmed (preloaded) map. Back up this file before deleting or overwriting it.
•gmapprom.sum -check-sum file, mapupdate related, can be deleted.
•gmapsupp.img - This is the common file name for Garmin supplementary maps.
•*.unl - Unlock code files for Garmin maps.
•gmaptz.img - Garmin time zone map.Contains Timezones of different cities/countries for selecting the right timezone by the device based on the location.
•gmaptz.sum -check-sum file, mapupdate related, can be deleted.
•gmapdem.img - Garmin DEM (digital elevation model) It displays contours on compatible devices
•gmap3d.img - Garmin 3D buildings map
•gmap3d1.img - 2nd Garmin 3D buildings map
•GUPDATE.GCD - Used for Garmin firmware update.
•Locales.xml - It stores default language, currency sign, time zone, etc settings for different countries.
•*.Gma -Garmin new protection digital certificate. Only the legitimate buyer of a Garmin map product license will receive the GMA file connected to his/her GPS unit. That's implemented for maps with mapid >= 2200.
•Garmintriangletm.ico - it's the icon will appear on myComputer when you'll attach your outdoor gps
•Nuvi_drive.ico - it's the icon will appear on myComputer when you'll attach your Nuvi USB
•Startup.txt - Edit this file to display a message while your unit is powering on.
•*.sum - files left by updater: can be deleted.
•TrafficProvider.xml - It stores infos about your traffic providers subscriptions (Nuvi 1xxx and 37xx series etc.)
•sw.unl - unlock code file for phones Garmin MobileXT application