I'm using mrwalkman's firmware.How can you flash the WM1a with WM1z firmware and what sort of difference are you experiencing?
Honestly the difference is insane, night and day. There's people on the mrwalkman firmware thread here who own WM1a & WM1z, quite a few actually, who have been kind enough to share their impressions. Long story short, with this guys firmware the WM1a sounds as good as a WM1z, or so close it's very hard to tell them apart. But if you add Mr Walkman's firmware to the WM1z it then takes that up a notch too, supposedly.
I was a big skeptic tbh, but it's true, the player sounds absolutely superb with his firmware. Before it was nothing special for me, just a DAP.