Another trick that might work.

This time, simply use BTC's v45 autoextractor. With this release, they've completely changed the way the flasher works. The firmware ID string verifier is not internally included in the flasher now; instead, there's an external IDString.txt file that comes with it (or generated at runtime).

The text file says:
"DVDRW IDE1004 ""Drv045.hex""Y"

You'll have to change the contents of the first quote to your recorders' ID string to something like:

"Memup DRW1004IM ""Drv045.hex""Y"

(Note: make sure there are 24 characters within the first quote; there are three spaces between 'Memup' and 'DRW1004IM' and 7 spaces between 'DRW1004IM' and the last ' " '. This hold true ONLY if your firmware ID string is as stated above)

So what you should try is (step-by-step):

1) Empty your Windows TEMP folder
2) Double-click on the self extractor then exit immediately.
3) Look for the newly created folder INSIDE your TEMP folder. You should find the following files: DRV045.HEX, FIDE.SYS, FIDEVXD.VXD, IDEFLASH.EXE and IDSTRING.TXT
4) Modify the IDSTRING.TXT as mentioned above and save it.
5) Now run IDEFLASH.EXE

This time it shouldn't complain.

NOTE: adapt "Memup DRW1004IM " to whatever your exact firmware ID string currently is.