Originally Posted by GethPrime
Fix Xperia C Red Light brick
Are you facing that the red led on your device blinks and there is no other signs of life? Then you are in the correct thread, I faced this issue when flashing a corrupted recovery but then I found out a easy way to fix it without opening the device or sending it in to Sony.
1. The first thing you need to do is to make sure that you have downloaded Sony Update Service and have installed it onto your PC from the link above, if not, do it now.
2. Now launch Sony Update Service and select Xperia C in the list and then press Next.
3. Hold the Volume Up button and plugin microusbcable while doing so, if that doesn't work for you, hold power + volume up and plugin the microusbcable while doing. Keep holding button combination for a few seconds and wait for a green light on your phone, if it appears check on
your PC so that it's detected.
4. Wait while the firmware is being downloaded and reinstalled on your phone and enjoy your working device!
It worked for my Xperia M (rooted on JB 4.3) with a locked bootloader which was STUCK on bootloop screen and when I did the whole thing with holding the power and volume up button (after I let the battery die after so many bootloops it did), FINALLY I was able to take it to flashmode, while I had selected from Sony PC Companion to repair my phone, and after 3-4 tries, I DID IT!!!
Thank you so much for this thread ( I DEFINITELY pressed the "thanks" button), it really SAVED ME time and money (because I was planning to send it to Sony to fix it and you ALL know how bastards Sony is)!!!! And to all those of you who are DESPERATE to fix their phone (I hope you read this thread), DON'T PANIC, and DON'T GIVE UP!!! It took me 2 days of searching the web, and FINALLY I MADE IT!!! There are ALWAYS solutions to these kinds of problems!!!!