Share your experience!
it will work for both theLT15i & LT15a, it WON"T affect the 3G since its only software not hardware
http://forum.xda-developers.com/showthread.php?t=1199003
or
http://forum.xda-developers.com/showthread.php?t=1199597
I'll add more pictures soon
(Screenshots taken from ShyamSasi user, credit goes to him
)
Special Thanx to
for the heads up
http://talk.sonyericsson.com/message/92137#92137
Solved! Go to Solution.
an even Easier alternative
download the app, transfer it to your SD card
Download Apk Manager
W251bGwsMSwxLDEsImNvbS5tYWdtYW1vYmlsZS5hcHAuYXBraW5zdGFsbGVyIl0.
open "Apk Manager" and voila select the apps that you wan't to install
let me make it simpler how to install the Backup & Restore app
download the apk on your computer, send it to yourself through email, make sure you send it to your Gmail
now on your phone
go to settings -> applications -> check unknown sources
wait for the email, once you get the email, open it, and instead of downloading the attachment it will allow you to install it, voila, done
download FlashTool
http://forum.xda-developers.com/showthread.php?t=920746
firmware
http://forum.xda-developers.com/showthread.php?t=1199597
Install it and you will see 5 folders
5.a. Unplug your USB cable from the PCb. Power off your phone and plug the USB into the phone
c. Press back button and keep your finger on button
d. Plug USB cable into your PC whilst holding down the back button on your phone
e. A green LED will appear
f. The process will automatically detect your phone and start flashingg. When "Found at USB/........" appear on flash tool you may release"back button", sit down, relaxand wait.Hope this is helpful to you6. IF the "Start Flashing" message appear everything`s ok if not...repeat. Sitdown and relax (again )
7. When last message appear unplug/plug USB cable
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Regards,
Ricardo Rendeiro
Make sure you backup everything using the Backup & Restore app
if you need the app you can use this link instead to download the apk
New Link
How to install it
You need to
go to settings -> applications -> check unknown sources
download IO File Manager
https://market.android.com/details?id=org.openintents.filemanager&feature=search_result
download the backup & restore app, transfer it to your SD card, use OI file manager to find it -> tap on it -> install it
Contacts
just to play it safe sync your contacts w/ google if you haven't already
SMS/MMS
if you don't want to use the backup & restore app then
Install "backup SMS" to back up your SMS and MMS to your Gmail
https://market.android.com/details?id=com.zegoggles.smssync&feature=search_result
or your SMS use
"backup & restore SMS"
https://market.android.com/details?id=com.riteshsahu.SMSBackupRestore&feature=search_result
or for your MMS use "Save MMS"
https://market.android.com/details?id=com.schwimmer.android.mmsextract&feature=search_result
Call Logs
And for call logs this is great
https://market.android.com/details?id=com.yang.android.ansta
Great job 
I was about to post on your thread, Thanx for the heads up