TM-1 black after firmware upgrade

Dear Elektronaut fellows,

I had the TM-1 / Windows 7 issue that TM-1 kept disconneting randomly at times.
When checking the omniscient Internet, I found the firmware update 1.05 that is supposed to fix that problem.

Just having finished sending all the data of the firmware upgrade to TM-1 via C6, the TM-1 disconnected itself and did not show any sign of life since, despite dis-/reconnecting, rebooting etc.

In the update note it says that you should not disconnect the TM-1 during the process - but it did it himself instead!

Any chance to get it working again?!
Does anybody have any ideas?

Thanks in advance
Thomas