I successfully updated my FA-50 AIS. Had to make a crossover ethernet cable since we don't have a hub onboard and the tiny shops on the remote South Pacific atolls are out of fresh vegetables and don't seem to carry crossover ethernet cables, either. ;)  A bit of splicing + turning off windows firewall and I was able to update our FA-50.

Do you have the GP-150? I cannot connect to it to update it. I have the serial output on Data4 enabled with a DB9 output and then connected to a DB9-USB converter. I have been using that for years to provide GPS data to my computer, but I can't get the Furuno update software to connect.

FYI - We know a SM with Garmin and they have been blissfully unaware that they may have been transmitting erroneous AIS position information since 2019. It is not a Furuno specific bug. It's easy to remain unaware that your reported position is missing or incorrect. 

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Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com