Thank @taxi1 we have also RemoteSW folder from nuvi 3597

[Only registered and activated users can see links. ]

This is files from RemoteSW:

006B048201.bin - GTM10/12&20/21 (old classic TMC for all FM radio 10/12 - 1 generation and 20/21 -2 generation)
006B090100.GCD - GTM25/35 (3 generation)
006B125700.GCD - GTM26/36 (4 generation)
006B139900.gcd - GTM60HD (HD traffic)

For above name for files thank to @Giomen

006B107300.gcd - ecoRoute HD
006B154600.gcd - ???
006B154700.gcd - GTM70
006B161600.gcd - ???
006B161601.gcd - ???