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Venity

So first,

I replaced the battery of my old Xperia T (lt30p). The battery charges and works BUT my buttons dont work (volume , power).

I thought its the problem of the stock rom and tried to reflash it but my phone doesnt even goes into fastboot. Bootloader locked.

I really don't know anymore how to repair the buttons. Everything is on the right place.

Anyone has an idea?

Thommo

You need Flashmode to repair - Fastboot is for rooting etc

Performing a system repair using PC Companion - This will factory reset your phone and erase all data

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP

Venity

Well... Already tried it. Like I said the buttons don't work for some reason I can't power+volume up or hold volume down while connect to pc. Nothing happens. Yesterday I connected it without the battery and while this putting it in , sunddenly it start showed empty battery notification and force shuted down. I tried to do this a few times but it only worked 1 time.

SophiaW

Hi Venity, welcome to the community!

I advise contacting Sony Xperia Customer Care in your region in that case - just click on the link in my signature to find contact details for your local team.