software update

[Sadia]

hi

I recently updated the 4.1.2 version on my sony xperia P,but  its not working for me. How can I take it back to the pre software. Thank you

[mithun_xperiap]

U cannot downgrade ur device to ICS now, u need flashtool and the firmware .fft for that, better u upgrade to latest JB firmware version .100

[Sadia]

please tel me hw I can upgrade to that version, because the negative thing for me about the 4.1.2 version is that calling and recieving calls are becoming real slow, I have to use my headphone to make and recieve a normal call. when I use Go launcher ex, its like the whole goes real slow

[jackxperiaP]

update to the latest .100 .. check with SUS and PCC .. .100 update solves the call lag issues.. aft updating jus do a factory reset ..