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
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 command.com, io.sys and msdos.sys (the system ones)
2/ download mtkflash 1.80 from http://dhc014.rpc1.org/howto.htm
3/ Add MTKFlash.exe to the disk.
4/ Get JS07.BIN from http://codeguys.rpc1.org/firmwares/stock/1673S.JS07.stock.rar.
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.