I use a TM-NANO-3T running OpenVIX
Kernel 3.9.7 Build 147 Version Apollo 2015-02-03

I have not updated for quite a long time. I realise I cannot backup the settings.
Sorry if these questions seem a bit basic but I am a bit nervous about doing a complete build.

After updating to version 4.2 do I need to do anything with Positioner Setup menus?

Will I need to set dish limits again?

What essential settings do I need to check on my existing settings before I start the build process?

Thanks