@X-Ray
Yes you can with the jumpers on the board, you can turn it off, on, write enable or write protect, both cards work the same way. You can't do it with software, If you want to reprogram the flashrom you'll have to open your Amiga to set the jumpers so you can rewrite the flashrom.
You could of course connect switches to the jumpers on the card so you won't have to open your Amiga.