This happened last Saturday (July 20, 2013)
While I was trying to flash a ROM... the internal sd card got corrupted (this was normal for the ROM because the developer left a MISTAKE on the zip's scripts)... the phone asked me to reformat it but before doing so... I tried some solutions online because MY IMPORTANT FILES ARE INSIDE THAT INTERNAL SD CARD
It told me to input this in the terminal emulator:
dd if=/dev/zero of=/dev/block/mmcblk0
after that I rebooted my phone... phone won't boot anymore, it was soft-bricked!
I plugged it in the wall charger, after 24hrs, RED LED appeared, I kept on waiting till it turns green or disappears...
After waking up in the morning I rushed to my phone, the RED LED is gone! I unplugged it from the wall charger and prepared my flashtool on pc for flashing the 6.2.0.B.211 Jelly Bean firmware FTF file. I plugged my phone to the pc while holding down the volume down button, RED LED appeared after connecting, I kept on holding the volume down button for 10 minutes, but between that, I ACCIDENTALLY UNPRESSED THE VOLUME DOWN BUTTON AND IMMEDIATELY PRESSED IT AGAIN... After that, the RED LED disappeared! Nothing happened! Flash process didn't work! I unplugged it from the computer and plugged it again with volume down pressed, still nothing happened, no RED LED, nothing, I just heard the Windows "USB sound" and SEMC Flash Device appeared on Windows Device Manager.
Is the accidental unpressing of the vol down button the cause of this?
I charged it again on the wall charger using Stock Sony charger and after 30mins... RED LED appeared again... Should I wait for the green LED?
I repeat... I have unlocked bootloader and IT WAS ON cobrato's stock modified kernel for .211 firmware when this happened.
My Acro S charging: