What type of devices are showing this problem and what is their age? EZSrve may not have the correct value for the link database size? If you are running a PC download the free SimpleHomeNet Utility Suite and use the Manage Device Links tab to display the link database for one of the devices you are seeing the FF values. The Manage Device Links screen has a pulldown which allows the selection of Small/Large Link Database Size. Use the Small option first. If you do not see the correct link records, change to the Large option and Display Link Records again. This will tell you where the link records are written and whether there are any with the FF values you see are seeing. Assuming the link records displayed are correct for either Small or Large, check the MSB= value in the devices3.xml file for that particular device. If the correct link records are displayed by the Utility using the Small option, MSB=0F is the correct value. If the correct link records are displayed by the Utility using the Large option, MSB=3F is the correct value.