Hi and Welcome!
you happen to own a Dell computer? D300 firmware is available on Dell Support website
Some say that this is the same as the SH-S223
To be exactly: SH-S223F.
but when I use the TSDNWIN.exe with any firmware Ive found so far, it says it it incompatible.
You might read the firmware chapter of the Samsung FAQ (see my signature), please.
I have heard somthing like "no RPC2 firmware = no rpc1 firmware", but the drive must have firmware somewhere.
Any drive comes with RPC2 firmware. It is stored on a chip within the drive.
If it exists on the drive I imagine it exists also on the net.
Hopefully in .bin format.
Again, read the FAQ