- 2.30 to 2.59 is a rather long hop, but the way the update process works it should be ok.
- It's is highly recommended that they both have the same firmware version in order to avoid possible incompatibilities.
- The settings should survive the update process and new settings should get their default values.
But as always when doing something like this it's better being safe than sorry
So start with updating an RRC that you have where you can see it, and make a copy/screen dump/etc of the settings, at least the important ones.