I think is possible but they will charge you some money for labor cost.

ok guys..about hw 2 upload the modded acoustics i will give the credits to rufinus cz is he's the 1 hu tell me how 2 do dat n i figure out how to put flash menus into w850i myself by using the same method..my phone is cid51 so i duno bout cid49 n 52 but u can try as well..any accident is ur own responsibility..

1.download xs++ 1.6.7 frm http://www.esnips.com/web/XS++http://www.esnips.com/web/XS++
2.download the flash themes wit .swf files n modded acoustic here

acoustic> http://www.speedyshare.com/112443253.html
flash menus' .swf files>  http://www.speedyshare.com/736795382.html

3.extract this 2 files into the folder named files_to_upload inside the xs++ folder
4.remove your memory card n sim card from the phone
5.open xs++ 1.6.7
6.plug in the usb cable into your phone by pressing 'c' button on ur phone
7.click connect
8.click the Customize File System
9.click the setting down there
10.click the BreakXS at the Wayin
11.click on FSX at the configuration
12.then click Start FSX and wait it finish loading(it uploading files from ur files_to_upload folder to your phone)
13.wait until it says disconnected...unplug ur cable only u unplug ur phone from ur cable..

and dats it..put bak ur memory card n ur sim card n try ur new flash themes n acoustics sound

the flash menus is here>  http://www.speedyshare.com/269182264.html
jz follow the steps 1 by 1 n u wun hav any problem..

P.S. I AM NOT RESPONSIBLE FOR ANY ACCIDENT HAPPENS TO YOUR PHONE!!

after u connect to xs++ pressing c button..u can c those logs on the left side..there got show ur cid

Aiksss thanks for sharing, bro! Downloaded the files.. Will try some other time.. Hehe.. And how to check my phone what CID code it's on?

bro, which button is use to upload file to phone huh?

wat u mean?jz follow my steps

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You can actually modify the current .thm file and redirect it to your flash theme menu.