downgrade to ICS

[ved]

How to downgrade xperia ion jelly bean to ics.

[Uliwooly]

You have 2 options

1) take your phone to a Sony repair center 

or 

2) use flashtool

[Uliwooly]

How to manually update, downgrade, root 2012 Xperias

http://talk.sonymobile.com/thread/41609

[invincible_punk]

I have upgraded my xperia ion fron ics to jb but now its having lag issues I want my ics back how can I do so?
And fron where I can get flash tools?

[invincible_punk]

From where I can get flash tools?

[_alexdon_]

Just search for flashtool on google.You can use EMMA from sony.