I have both the 1633 and 1673, i accidentally using omnipatcher applied the firmware patch of 1633 to the 1673, and now I cant see the drive anymore on my computer. I only see the 1633. I have disconnected the 1673 and reconnected many times, but my computer wont pick it up. Please help!

Welcome to cdfreaks :slight_smile:

The good news is your drive should be able to be restored but you will have to use MTKFlash at DOS.

This is the procedure I recommend:
1/ create a bootable dos disk. Remove all files except, io.sys and msdos.sys (the system ones)
2/ download mtkflash 1.80 from
3/ Add MTKFlash.exe to the disk.
4/ Get JS07.BIN from
5/ Add this to the disk.
6/ Select the jumpers on your drive for master and remove all other drives.
7/ Boot to the floppy while holding the drives eject button.
8/ Type in MTKFlash 3 w /b /m JS07.BIN. The 3 is secondary master. See the step 2 site for details.