I'm mad!

I got a Hifi Walker H2 to replace my Surfans F20. The first one I got, the line-out wasn't working, and my bluetooth headset could only skip once until I turned the screen on again.
I got it replaced with a new one, and the exact same issues happened.
So at that point, I just refunded it, and decided to get another F20. It just showed up today, and now this thing has the exact same issues.

My old one was on version 2.7, and the new one is 3.4. The old one still works fine (minus the issues that caused me to replace it in the first place.)
Should I just try Rockbox or something? does anyone know if it would actually help? Is there even a working version for this device?
I don't know if I can ask them to just send me one without the current firmware or something, but I think this is the issue.