I think that we still can find some old nuvi series 14xx who dont have JCV enabled by default and if we change title this people wont find this tutorial.
First series of nuvi 1300 have D1340-00 and for this nuvi was writen this tutorial.
Then some time later nuvi 1300 come in store with number D1340-81 with full JCV support.

This is what i found on nuvis 1300 and 1350 from start of this tutorial to today:

1300 first series D1340-00 (no JCV,speedlimit and lane assist)
1300 later series D1340-80 or 81 (all enabled by default)

1350 first series D1340-30 (Enabled LA,speed limit,but disabled JCV)
1350 later series D1340-80 or 81 (all enabled by default)

1390 and 1490 all the time D1340-50 all enabled by default

p.s.
If you change on 1xxx EU/US splash number from D1340-50 to D1340-65 you can play with oem.xml function (this know the best dasilvarsa )