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2016-02-04 02:33 PM
2016-02-04 03:24 PM
it is called a bootloop.
where you trying to flash it with a custom rom?
try to repair it using http://support.sonymobile.com/gb/tools/pc-companion/ (assuming you did not unlock bootloader)
If you tried it flashing with custom rom, try to do the process again,
2016-02-04 05:46 PM
You can try removing the battery in your Xperia U to stop this. However, if the same thing starts again when you put the battery back in and power on the phone you should try performing a software repair using PC Companion as nolramlb suggested.
2016-02-05 12:48 AM
2016-02-05 12:10 PM - last edited on 2016-02-06 10:47 AM by alexdon
Do you get as far as step 10 in the software repair guide (http://talk.sonymobile.com/t5/FAQ/How-to-perform-a-software-repair/m-p/1061294) before you are unable to proceed?
2016-02-06 10:47 AM
2016-02-09 09:07 AM
2017-07-18 10:24 PM - edited 2017-07-18 10:43 PM
I am also having a problem with boot loop, I have also tried using the Companion Software Repair but it stoped and says software error, contact Sony support.