My Siemens MT 50 crashed - please, help me!!!

So, I tried to load new firmware to my MT50, it was number 17 and after 10 minutes of flashing fall out the electric current...I hope thet I can repair it, but I don't know how...I used WinSwup 32 and now Pre-Check writes : "Could not Ping Mobile", if I skip Pre-Check then it writes : "Error on waiting for Ack EOT"...I tried older version and then after Pre-Chech is done it writes : "Could not switch on Mobile" and if I skip Pre-Check it writes : "Cant connect to Mobile with BootstrapLoader on Com 1"...So, what now? Please, help me...

I can't turn it on, mobile doesn't respond neither with data cabel, I'm desperate...