Here is my summary of the experience in converting my north american nuvi 265wt to Malaysian firmware.
Quick summary: If you want to use your nuvi 265w, 255w 205w in North America, DO NOT flash to MAL/SG firmware. Instead flash to North American 465t firmware.
Long summary:My exact model is:
"SW ________ Ver 7.20 nuvi 265W W P2 V2 2GB" (from the debug screen)
GarminDevice.xml reports: "006-B0827-00"
I flashed directly from north american 7.20 SW directly to dvpro's modified MAL/SG firmware 3.10.
ComparisonPRO:
-Lane view
-Junction view (I didn't actually see it but I believe it's there)
-Option for calibrating touch screen
-Compass on map
CON:
-Bad audio - The mal/sg firmware seems to make all sounds - even just the screen tap sound - sound very bad. It sounds like it will blow the speaker.
-Broken TTS (the English TTS voices - all of them - pronounce north american street names so badly that it must be disabled as it is completely useless).
-Broken TMC traffic - before flashing I had 2 subscriptions, lifetime Navteq Premium and Lifetime Clearchannel. After flashing it said I had none. I re-entered the codes and it accepted them but still said I had no subscriptions. Traffic events would only be received when the unit first booted up, then would stop.
-Debug screen glitches - when you enter debug screen the language of the unit would reset to Africaans.
-General -seemed buggy - for example, it took nearly 1 minute before recalculating when I missed a 90 degree left turn one time.
-No EcoRoute (but this feature is sort of useless anyway)
After having so much trouble with the Mal/SG firmware I decided Lane Assist and Junction view were not worth losing TTS and TMC and I decided to go back to original firmware. However, I then discovered that you can flash the nuvi 465t firmware, and it proved to be excellent.
nuvi 465t firmware compared to original nuvi 265wt:
PRO:
-Lane Assist
-Multiple Routes (15)
-Truck Profile/options
-General - better configuration of software - for example, simply tap the gps signal to bring up the details, instead of press and hold.
CON:
-No EcoRoute (but this feature is sort of useless anyway)
-One extra warning screen when you turn on GPS.
Everything else works perfectly on 465t firmware: TTS, TMC, bluetooth.
If you are planning to use your nuvi in North America, I must say, unless you are DYING to have junction view, then do not flash Malaysian firmware on 2x5w series, instead use firmware from North American 465t. To get modified 465t firmware go here and look for link from acleite, either version 3.10 or 3.20, then you can do official update to 3.60.
http://www.gpspassion.com/forumsen/pop_ ... _ID=135007I went from US 7.20 -> MAL/SG -3.10 -> US (465t) 3.10 -> 3.20 -> 3.40 -> 3.60.
I hope this helps someone.

Thank you to all.