The 19" A1200 we use at work apparently came with the CC reset fix done. But it didn't
Try this....
Plug your surfcard in
Boot your A1200
Run Miamiinit or Genesis
If you get the error device not found
pull the card out and push it back in, while the amiga is on.
Then it should find the card using cnet.device
Once you tcp/ip stack is configured save your config.
You'll have remove / insert every time you power up your amiga for the first time before going on line.
Eg: once wb has booted.