Well, partially the description is too detailed, OTOH there is missing some background info. Like in this case. As I've unterstood, there are certain, older fw versions where are some menu entries missing when not registered first. No idea which... The only one you really need is "Update your Kindle" - and this was always accessible right "out of the box".
The proof of the pudding is to eat it. I.e. just try it out if you are able to do the initial version downgrade. Finally you end up with a relatively new fw version (like 5.8.7), and then it's still time to register your device with Amazon if really needed...
Gesendet von meinem Google Pixel mit Yabba-Dabba-Talk.