Just use the firmware for whichever product that you have. Just enter the product's model number in the keyword field. Click here for text version. Port filtering added. The firmware worked fine for us, although we did see an occasional frame refresh problem.
New firmware tends to appear there first.
Go here . If you have not a user of this game or you have not encountered this problem, you should NOT use this firmware. Please note that we do not offer any support on beta softwares. You can upgrade at your own risk. The upgrade instruction is included in the zip file as readme.pdf.