Struggling with OpenWrt and Bintec rs353aw

(You may want to move your thread to the For Developers section.)

I don't understand this part of the question. You asked about compiling a release version. Once you compile it, you have a release version.

Just to be sure you understand what those are:

Also:

It seems you're using some unofficial code. I am referring to official OpenWrt. Perhaps you should ask @armSeb (wow...he has an account here - I just checked).

(Maybe move to the Community Builds section.)