Hi @SomeNetEngineer 

Thanks for posting in our business forum.

In rare cases, refer to the note it included on the product or firmware page. If it specifically marks V1.0=V1.20=V1.60 and their firmware can be universal. That's a special case and we don't explain this in the Knowledge Base or elsewhere.

The firmware and product page also explicitly explains the same thing as the KB post.

Usually, the performance and quality are likewise between 1.0 and 1.2 but the chipset or architecture is different between them. As you know, the chipset may not be available after some time and we may need an alternative solution company to continue the production.

We tried to not mix the versions if we had major components changed. A new version is necessary to separate them and we can tell that easily by knowing the version.

X.6 or X.26 mainly means a different manufacture in another region. We have two main manufacture locations and we are expanding another one in the Americas(I cannot recall what country is that but it is based in Americas).

I think I have explained this multiple times on the forum. If you would like to do some search work.

(Some models or versions are not planned to be sold or available in certain countries. So you don't see it available on your local website.)