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Repair Garmin nuvi 465T
Download Firmware v4.20 (Apr 03 2013):
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Update Device with Garmin WebUpdater (not Garmin Express)
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Connect Device to PC via USB, internal memory should look like as follows:
Main root with 3 folder
\debug
\Garmin
\Reports
The only folder of your interest is \Garmin, inside this folder you should have at last these subfolders and this content
\Diag
\ExtData
\GPX
\Help
\POI
\Text
\Vehicle
\Voice
GarminDevice.xml (settings File, it tells almost everythings about your Device)
gmapbmap.img World Base Map (do not remove this)
gmaptz.img Time Zone Map
gmapsupp.img Detailed Map (last update Map), if it exists
gmapprom.img Detailed Map (last update Map), if it exists
gmapprom1.img Additional Detailed Map (last update Map), may be not present
gmapoem.img OEM Preloaded Map, should only be present on brandized Device like Honda or BWM
Some others stuff are present in this folder, do not care of them
A last 1 Map (gmapprom.img or gmapsupp.img) must be present to make Device work proprerly
Additional Maps (max 2) can be copied in external microSD, folder \Garmin (gmapsupp.img and gmapsup1.img)
What you have to do:
1) Update Firmware with WebUpdater (you should re-flash same version), your Device should reborn
2) Download Map I told you in my Post #64 and Unlock it
3) Copy the new unlocked Map in folder \Garmin of your Device (overwriting the existing one) OR copy the Map in folder \Garmin of your microSD
That's All