Old Kindle & New books

[penfold]

I have a very old kindle which has been great. But I have not used it much recently and now I wanted to buy another one I just realised that it no longer connects to the store. It seems there was some older devices (like mine) which were blocked from connecting due to them being too old. Now as far as I can see, I can still buy a new book via my computer and it should appear in my library which means it should then be available on my kindle. The problem is that if I try and sync or go to the store, it does not work on my tablet. From what I can see, I need to download the update manually and install it? https://www.amazon.com/gp/help/customer/display.html?nodeId=GX3VVAQS4DYDE5KE#GUID-4C9EFFF2-2B4E-4DB8-997D-6DC9B3566220__SECTION_AA6BD2D5AAF04CE196510F7D3FA2B2F0

 

Has anyone done this and if I run the update manually, will this also allow me to deregister and re-register to a new amazon account? I would like to change the amazon account registered on this kindle, so I can buy a new book and download it onto my old kindle.

 

Thanks