The FLX1 runs FuriOS, which is an operating system based on Debian, designed and oriented for mobile use without any artificial limitations.

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I use Swing music player. It’s web based and plays in a browser. It’s not super featured like subsonic but good enough that it works for me.

I didn’t like any native music player and e book reader available on Linux… So setup waydroid for Symphony and Moon reader And using it on surface pro 6 is quite a nice experience. But I wished they could update to newer Android version.