I installed LineageOS on my Samsung device, and there doesn't seem to be a radio app. I have access to an identical device which is running the stock OS. I extracted the radio app on the other device (with App Manager) but cannot install it (unavailable shared library com.samsung.device). (Galaxy A21s, Exynos.) How can I listen to the radio on this device?

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[–] JustARegularNerd@lemmy.dbzer0.com 8 points 4 hours ago

I was going to recommend RevampedFMRadio but I see your device isn't either Qualcomm or MediaTek.

There's some discussions on XDA and Reddit I found where someone wanted it on an S10/S10e and the responses were that the Exynos chip does not have any FM radio functionality at all.

I looked up your Exynos 850 chipset and Samsung's datasheet says it does have an FM radio, as you yourself surmised by it being in the stock ROM.

There is this app (seemingly without anything prebuilt) for a different Exynos chip, but given it hasn't been updated in 3 years and the chip difference, I wouldn't have high hopes.

Otherwise you might have more luck asking the LineageOS maintainer why FM radio functionality is missing and if they could add it.