Spending big on the Eversolo master or A8 is foolish , terrible support. Real amateur software development at Zidoo / Eversolo. Cumulative updates should include all revisions prior.
Not cool to have a perfectly good working product and hobble it with botched firmware . I believe USB out is important whether you use it or not. Don't take away features!!!! Every update seems to negativity affect a feature or omits something.
I was initially impressed but have lost all confidence that they will correct issues.