how to upgrade yur sony to GB or ICS

1. Flash tool : Install it in your pc.

For GB

Download the kernel for the corresponding phone

Xperia Mini (ST15i)
!4.0.2.A.0.42 - http://www.mediafire.com/?uboo3lrdxnoeldn
Xperia Mini Pro (SK17i) 
!4.0.2.A.0.42 - http://www.mediafire.com/?hevz3x5w9pqt24q
Xperia Mini Pro (SK17a) - "a" model 
!4.0.2.A.0.58 - http://www.mediafire.com/?433tco785pj1y69
Xperia Active (ST17i)
!4.0.2.A.0.42 - http://www.mediafire.com/?3zm7iss0sid94wr
Xperia Live with Walkman (WT19i)
!4.0.2.A.0.58 - http://www.mediafire.com/?4deeznrbldz886u
Xperia Ray (ST18i)
!4.0.2.A.0.42 - http://www.mediafire.com/?0oi9t2m0z5p8a9y
Xperia Arc (LT15i)
!4.0.2.A.0.42 - http://www.mediafire.com/?8aa5x52vc9dc25l
Xperia Arc S (LT18i)
!4.0.2.A.0.42 - http://www.mediafire.com/?9mz2rhdouu6ggtk
Xperia Neo (MT15i)
!4.0.2.A.0.42 - http://www.mediafire.com/?4qy6vd4ndbfy8wy
Xperia Neo V (MT11i)
!4.0.2.A.0.42 - http://www.mediafire.com/?8bwwe8m6c49vs4t
Xperia Play (R800i)
!4.0.2.A.0.42 - http://www.mediafire.com/?cne2yvrtcu3ccvn

For ICS

Download the ftf from the following links:

Quote:

Xperia Mini Pro:  SK17i: Here or Here SK17a: Here or Here Thanks to Jozinek Xperia Live with Walkman: WT19a: Here Thanks to davidcmc WT19i: Here Xperia Mini:  ST15: Here OR Here Thanks to shufuking, Thanks to expeacer Xperia Active: ST17i: Here Xperia Ray: ST18:Here OR Here Xperia Arc S: LT18:Here OR Here OR Here Xperia Neo V: MT11:Here OR Here Xperia Neo: MT15:Here Xperia Arc: LT15: Here OR Here Xperia Pro: MK16i: Here

Unzip the file and place it in firmware folder in flash tool (C:\Flashtool\firmwares)

* Hold the following button while connecting your phone to a computer with a USB-cable:

• Menu button (for Xperia™ arc, Xperia™ arc S, Xperia™ neo, Xperia™ neo V, Xperia™ pro).
• Search button (for Xperia™ PLAY).
• Volume up button (for Xperia™ mini, Xperia™ mini pro, Xperia™ ray, Xperia™ active, Live with Walkman™, Xperia™ S).

TO ROOT YOUR GB OR ICS CHECK MA PREVIOUS BLOG ON ROOTIN