Can't get the Minecraft beta to the right version

I bought a bedblock edition of minecraft from windows 10 mobile(1.9.0) but I want to play the beta version(1.11),and I don't know how to do it(or maybe I can't get the beta version of minecraft windows 10 mobile,just like the ios version?)

You cannot, The Minecraft win10 beta is a ported version of the pocket edition, which means you can't play with anyone unless they have the beta as well, you're probably best buying the PC version of minecraft, but you still can't play with Xbox One unfortunately.

Hi !

If you have a Beta version of Minecraft, I think you can only join people with the same beta version. Maybe your others friends can't be joined because they don't participate to the beta program.

Regards

Is it possible that one of you or your friends has joined the Minecraft Beta Insider program?

If so, you probably have different versions of the game, and only players with the same Minecraft version can join each other's worlds.

Check that you all have either the official Minecraft version of 1.11.4. If one (or more) have the current Beta version of 1.13.something, then you can't join each other's worlds.

Version 1.12.1 is the currently the most recent official version of Minecraft in the Bedrock edition.

If you (or your friends) have opted in to receive the Beta version of Minecraft, then you'd be at version 1.14.

So unless you actively used the Insider program to opt in to the Minecraft Beta, the 1.12 version is the most up to date version, and everything is as it should be.

If you want to play with friends that have 1.14, they either have to leave the Beta, or you'll have to join the Beta to get 1.14. But be aware, that using Beta versions, you are playing on untested software, which can cause unexpected crashes or data loss.