You flashed from what to what ?
May give us a clue as to what actually occurred.
You are probably gonna need a program called Dreamup, free to download and easy to use.
And a Null Modem Cable, so you can connect from the DM Serial Port to a PC or Laptop Serial Port.
Now then, there is a chance it may get more complicated, but you need to start here and work through it.
Loads on this Forum about this process, have a search and read, nowt to watch on the telly now, is there ?