Fuente: sonymobile
Enlace: http://talk.sonymobile.com/thread/35239
02-ago-2012 10:13
{GUIDE} How to Install ICS ( Ice Cream Sandwich) on Xperia™ Smartphones, Root and Downgrade to Gingerbread
Esta pregunta es una supuesta respuesta.
Thread Created on 16 April 2012
This is Guide to install official ICS Rom on 2011 and 2012 Xperias
Flashing your mobile is at your own risk,flashing may void your warranty and SONY would be in no way responsible for any damage.
It is suggested to remove sim card and sd card as well as format sd card before installing ICS
Backup everything before proceeding if you wish. Alternatives on How to backup Xperias
Before Flashing: If you are on original firmware ( that came with mobile ) then dial *#*#7378423#*#* in dialer > service info > software info > take a screenshot and keep the screenshot safe for future use
Optional : if you wan’t to backup your current fimrware then follow the first post below by 100rabh791
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Install ICS
1) Flashtool Preparation
All Users, download Flashtool and install it
Go to C:/ Drive > flashtool > firmwares > delete everything present and exit
2) Download Official ICS Roms
4.0.3
a) Arc S 4.1.A.0.562 or 4.1.A.0.562
b) Ray- 4.1.A.0.562
After downloading it , extract using Winrar to get the .ftf file
c) Neo V 4.1.A.0.562
4.0.4
| Mobile | Link 1 |
Link 2 |
Link 3 |
|---|---|---|---|
| Xperia S ( LT26) | 6.1.A.0.452 | ||
| Arc S (Lt18) | 4.1.B.0.431 | 4.1.B.0.431 | |
| Arc (Lt15) | 4.1.B.0.431 | 4.1.B.0.431 | 4.1.B.0.431 |
| Neo V (Mt11) | 4.1.B.0.431 | 4.1.B.0.431 | 4.1.B.0.431 |
| Neo (Mt15) | 4.1.B.0.431 | 4.1.B.0.431 | 4.1.B.0.431 |
| Ray (St18) | 4.1.B.0.431 | 4.1.B.0.431 | 4.1.B.0.431 |
| Pro (*) ( Mk16) | 4.1.B.0.431 | 4.1.B.0.431 | 4.1.B.0.431 |
| Live walkman ( Wt19) | (WT19i)4.1.B.0.431 | (WT19a) 4.1.B.0.431 | |
| Mini | 4.1.B.0.431 | 4.1.B.0.431 | 4.1.B.0.431 |
| Mini Pro (*) | Sk17a | Sk17i | 4.1.B.0.431 |
| Active | St17i | ST17a | St17 |
(*) On devices with a hardware keyboard be aware that the layout follows the flashing
if the rom is of .rar type then extract it to get the .ftf file
3) Placing Roms In Flashtool
NOTE: only .ftf files to be placed
Place .ftf file as follow- copy .ftf file to C:/ > flashtool> firmwares > paste
4) FLASHING ( same steps for all users )
Now run flashtool.exe, click on the flashing icon ( left side below «file» option)
Select flashmode > ok
On the left box you must see your firmware name and at the center its components like this
( IMPORTANT) On the very right side mark the following as shown
select ok
El modo flash es conectar tu telefono apagado y presionando la tecla de «Volumen abajo», asi aplica para modelos : WT19/SK17/ST15 y supongo que para los demas Xperias 2011
Wait for it to prepare. It will ask you to connect your mobile, follow the steps carefully and connect
Once flashing finishes, it would ask you to disconnect your mobile and restart.( It may take several minutes to restart ). and done.
Its your wish if you want to stay on it but i suggest you to repair your phone software using SUS. It will reinstall the original ICS software in your mobile 
For that download SUS and follow the onscreen instructions SONY UPDATE SERVICE
FINISHED FLASHING Please letme know how it goes by posting in below
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How To Root Your Xperia( only for 2011 Xperias)
Here you go 
{Guide} How To Root Xperia™ Smartphone Running ICS or GB ( Ice Cream Sandwich or Gingerbread )
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Downgrading to Gingerbread
There are 2 stes to downgrade
1) Official – Handing in the Xperia at Sony Service center You can request to have 2.3 installed on your phone ( warranty would remain )
2) Unofficial- Flash Gingerbread using Flashtool (your warranty would get void)
Here is how
Remember flashing may void your warranty and you are doing it at your own risk
This is how to downgrade
1)-Download flashtool- Flashtool and install it
Go to C:/ Drive > flashtool > firmwares > delete everything present and exit
2) Use saved rom from step 2) above or download rom
| Xperia | Header 2 | Header 3 | Header 4 |
|---|---|---|---|
| Xperia S LT26 | 6.0.A.3.75 | 6.0.A.3.73 | |
| Xperia P LT22 | |||
| Xperia U | |||
| Xperia Sola |
| Xperia | 4.0.2.A.0.42 |
4.0.2.A.0.58 |
4.0.2.A.0.62 |
|---|---|---|---|
| Arc S | 4.0.2.A.0.42 | 4.0.2.A.0.62 Link 2 | |
| Arc | 4.0.2.A.0.42 | 4.0.2.A.0.62 | |
| Neo V | 4.0.2.A.0.42 | 4.0.2.A.0.62 | |
| Neo | 4.0.2.A.0.42 | 4.0.2.A.0.62 | |
| Ray | 4.0.2.A.0.42 | 4.0.2.A.0.62 | |
| Pro (*) | 4.0.2.A.0.42 | 4.0.2.A.0.58 | 4.0.2.A.0.62 |
| Play | 4.0.2.A.0.42 | 4.0.2.A.0.62 | |
| Live with walkman | 4.0.2.A.0.42 | 4.0.2.A.0.58 | 4.0.2.A.0.62 |
| Mini | 4.0.2.A.0.42 | 4.0.2.A.0.62 | |
| Mini Pro (*) | 4.0.2.A.0.42 | ||
| Active | 4.0.2.A.0.42 |
(*) On devices with a hardware keyboard be aware that the layout follows the flashing
if the rom is of .rar type then extract it to get the .ftf file
3) NOTE: only .ftf files to be placed
Place .ftf file as follow- copy .ftf file to C:/ > flashtool> firmwares > and paste
4) Run flashtool> click on the flashing icon ( left side below «file» option),,,Select flashmode > ok
5) left side you must see your firmware name and contents, if you are not able to see contents then use an older version of flashtool ,, on the right side mark boxes as
select ok
6)Wait for it to prepare and it will ask you to connect your mobile, follow the steps carefully and connect flashing will begin and flash
Done
androidtek 