Migrating OpenAT v3.x to v4.x

Since Fastrack M1306B is obsolete,
I’m in the need to migrate an application developed and tested using OpenAT v3.13 to v4.24.

In the many documents my provider has sent me, there is no word about the differences between both.
Does any one know of a document where I can figure them out?

Thanks.

Got it!
Porting_Guide_From_Open_AT_v3.10_to_Open_AT_v4_1x_rev001a.pdf
included in a zip named
Delta between M1306B and FASTRACK Supreme.zip