When something broke up. »

Dammit people :/ You could have warned me that upgrading firmware can brick my phone! I have no idea what to do now, it turns on, blinks and turns off immediately. I have tried disconnecting the battery, upgrading again as described in my BAUKNECHT Service manual, restoring factory settings. Phone seems pretty messed up now. For those fresh with my case let me remember you what actions I have made so far.
It all started when I tried to change software using service packages (procedure from my SELECO Service manual, so: disconnecting battery, connecting,loading Phoenix (from PhoenixSlayer), checking NO CONNECTION, then flashing prommer, choosing firmware. In the middle of flashing procedure – bam – cellphone restarts and turns off immediately.
I then tried to proceed with flashing as described in service manual – I turned off the phone again, disconnected battery, and flashed in N/C mode this time with Refubrish rather than Restore User Product… it seemed like it was kind of working – the phone started up nicely… but it took about a minute before it turned off again in the same way. Tried few more times – no luck so far.
I am really pissed right now – I have followed Service Manual exactly and I was sure it won’t let me brick my device… what should I do? Inb4: “read service manual”, “you’re an idiot”, ‘RTFM”. I REALLY TRIED.