[Q] Xperia Neo won't start topic

Hi. My xperia Neo crashed, I tried to send a photo via bluetooth and the phone just turned off. I tried to turn it on, it appears the "SONY" screen, then the "XPERIA" screen, and then it restarts, over and over again with the same 2 screens. I searched topics, they say that I have to flash it, but I can't start the phone in flash mode, with power and back buttons, any software (Companion, flashtool) don't detect the phone. Is there any solution?