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i recently bought a sony xperia arc s from a friend....it had andriod 4.0...it was running slow so i wanted to downgrade it to gingerbread.....i used flashtool and flashtool failed saying processing kernal.sin failed....now my phone is showing anything except phone and yellow sign when i turn it on...
I USED SONY UPDATE SERVICE AND IT DETECED MY DEVICE AND DOWNLOADED A FIRMWARE OF 230mb BUT IT FAILED WHILE INSTALLING A FIRMWARE...
PLZZZZZZZZZ HELP ME OR ELSE I LOSE 20000PKR PLZZZZZZZZZZZZZ...
HOW CAN I UNBRICK OR RESOLVE THE ISSUE
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redownload flashtool and the FTF file, charge your phone for 1 hour > try again
i should download which firmware file
why is it giving processing kernal.sin error
@huzaifamalik47 wrote:i mean which fft file
.587 etc
Have you unlocked the bootloader or flashed a different kernel?
i dont know about bootloader but i ve not flashed a kernal
how can i flash a kernal plzzz help me
If you can try on a different PC with SUS
Hi! Today I tried to upload my phone, from android 2.3.4 to the 4.0.4 version. I used Flashtool, and it worked well untill it ask me to upload the kernel to 4.1.B.0.587, it had the 4.1.B.0.431. I let it upload by it self when it suddenly shut off and now it doesn't turn on. The LED light green when I charge it but the screen doesn't light or anything. I tried to use Flashtool again, it detects the phone in flash mode, but no more. The Sony PC Companion doesn't work, it doesn't identificate the phone as LT18i, only detects a Sony dispositive.
I used the Upade Service ( http://www.sonymobile.com/gb/tools/update-service/ ), and the phone vibrated a little bit, but it didn't turn up. 
I'm charging it again. May I wait?
I'm Spanish, sorry if my English is bad.