Yesterday, my little brother pulled the battery of my Xperia Mini Pro (SK17a) while this was factory reset.
Right now, my phone is not been able to turn on. Just stays a long time after the SonyEricsson logo for a few hours. (sometimes fails to start, but only see the notification bar with the time. No menu or anything, everything is in black)
Try to flash it in a thousand ways and I realized I didn´t enter the recovery mode ( turning on pressing a combination of buttons ... I already tried about 13 or 14 with the physical and the tactile buttons next to the button to turn on the phone) but the only thing that I thought would serve not served. The only different answer is when I connect the usb cable to pc to flash it (by pressing the VOLUME- but is useless.
PS: Before I had already rooted and flashed the terminal correctly, but wanted to go back to reset. I've tried everything, but no response. Just not detected by my pc.
(Sorry for the english. This is not my language)
Greetings from Chile!!! ;D