you need no special Keyword. Just follow the Furuno Instruction. I did the FA-50 update 2 weeks ago and it was easy and worked fine on my 54. The Furuno GP-150 I did send to Furuno Germany and got it back last week. This week I reinstalled it and all is working functioning now. Also my Furuno Navtex is working good now again...
SV SAnta Isabella