Upgrade xperia U

[Haqabdul786]

I want manually upgrade my xperia U with official latest firmware 6.1.b.1.100
and
I also want to backup current firmware
6.0.b.3.184

Please reply thanks in advance

[Uliwooly]

Here you go 

http://talk.sonymobile.com/t5/Xperia-S-SL-acro-S/How-to-manually-update-root-downgrade-2012-Xperias/...

keep in mind that if you want to downgrade or update your phone "officially" you will have to use PCC or SUS or Bridge or OTA not flashtool 

[Haqabdul786]

Please give xperia U  official Generic firmware ftf download link for 2.3.7  (6.0.B.3.184    I want only flash original firmware on my xperia -not root & no cutom rom please send official firmware downlink please

[Haqabdul786]

Please give xperia U official Generic firmware ftf
download link for 2.3.7 (6.0.B.3.184 I want
only flash original firmware on my xperia -not
root & no cutom rom please send official
firmware downlink please

[_alexdon_ · Accepted solution]

http://forum.xda-developers.com/xperia-u/u-development/ftf-xperia-stock-generic-gb-firmware-6-t23764...

[Mango]

NOOOOO Don't Do That!!!! you'll Your Xperia Will Lag So Much and become unresponsive with many Lag and especially camera becomes Horrbile, if i was you i wouldn't, your choice in the End

[kingkong4688]

I updated my u and now it's lost service and signal I've restored factory setting and wiped the phone I've even replaced the antenna but still joy

[MAJID13]

please i need to unlock xperia U device .

this device was not fount at 

http://developer.sonymobile.com/unlockbootloader/

what can i do ??