Dedicated to MOD here.. Please Do Not Delete my POST... i know what am i doing. I strictly doesn't allow warez sharing. But i will upload official Garmin Mobile Installer into my web folder which i download from Garmin Official Website. But strictly no Serial or activation sharing over here!!
Proper Garmin Mobile XT installation Guide.Tools or software needed:

garmin xt is garmin mobile xt v5.0.0.20wp or 5.0.0.30wp.
base map is world base map <- it is optional but recommended
Voice Support Files <- obviously is voice files for navigation
All Files needed uploaded in Webfolder.Setup Procedure:
1) take out ur microsd card and plug it in to card reader. / connect ur phone with usb cable but select FILE TRANSFER mode.
2) run garmin mobile XT setup and choose ur Microsd as installation folder. it will start copy files until it is finish.
3) run basemap installation and choose Microsd as installation folder again.
4) run voice support files installation and again choose microsd as installation folder again.
5) now, u can either download malfreemaps full or lite version. Lite version provide faster animation but no significant less in detail. it is more recommended.
Note: BOTH MAP uploaded into Xperia's Webfoler. FREE MAP!! no Warez.
For Lite map : Copy gmapsupp.img into /storage card/garmin/ folder. then it will load itself.
For Full Map : Run the installer it self. In the end of installer will ask u whether wan to create gmapsupp.img? then click yes and generate it.. then it will auto copy da files into correct position on microsd. no worry.
6) take out ur microsd or usb cable. then now plug it into ur phone.
7) once xperia detect the card. it will autorun and ask u for install latest garmin Mobile XT and click YES and soft-reset ur phone after finish. then Voila!! u installed Garmin Mobile XT n ready to go.
Note: for those who doesnt see autorun. then open File explorer and browse to /storage card/2577/ and run the only files inside the folder. it will then ask for install.
Possible Problem:
1) Garmin Mobile XT keep on scan for internal GPS device and from bluetooth but doesnt found anything!! why?
A-> this is bcaz ur garmin mobile XT is not activated yet. i doesnt allow to provide activation "HERE". u know wat i mean then. PM
2) Garmin Mobile XT couldnt get fixed all the times!! WHY?
A-> This is bcaz u havnt download any data from QuickGPS program. that will significant fasten up the time to get GPS fixed. it can be taken 20 minutes to get GPS fixed under normal circumstances. but QuickGPS can make it under 1 minutes. if not, then u should update ur radio rom to v1.14 then u will have super fast GPS fixed like me! under 10secs everytime.
3) Garmin Mobile XT doesnt have my map detected.. WHY?
A-> This is either u havnt get ur first time GPS fixed. GPS is need to be fixed 1 before any search of address can be done. GPS is nid to be fixed so that Garmin know where u are and load the map n search.
If that 1 doesnt work. then click settings -> Manage My Data -> Map Set . See whether u have ur MFM v1.5x map inside already o not. if not, then recopy ur files. if yes, then post up ur problem here.
4) There should not hav anymore problem left. Thx for reading my post and hope it helps new experiencer to set it up.