To update ur phone,
1st You have to download and install the software from SE site if they didn't provide you with the disc. If you have then simply install it.
2nd After u install the software, you should be able to connect ur phone with ur computer via usb cable.
3rd Then to update your phone to the latest firmware, you need to download it from the site also =X i know abit troublesome but you have to do it.
4th After you download the updater down, proceed to update - follow on screen instruction. They will instruct you what to do.
Bear in mind updating your phone will make the phone setup to go back default. Your sim card and ur 8gb memory not affected. =) like when you a game and have a saved game there ~ updating it you will lost ur saved game file. LOL
Little advise - Since you have ur sony ericsson suite install on ur comp, you can backup ur files there before you do any update. =)
W995 do support MP4 format. It just that the size of the file need to be adjust to play on your phone. Not sure which other file it support, still in the process of discovering lol ~ You need a particular video software to adjust the file. =x Troublesome also but you have to do it also ~
er , i went to the setting > update service > software update and they say i have already the latest version of software o.0 ?