Android isn't firmware. It's OS. Firmware is embedded on things like the camera, wifi chip, etc. I don't know of any that have FOSS firmware. I hope I'm wrong.
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Unrelated, but oh my fucking god, I just realised that "firmware" is not a separate etymological category compared to "software" and "hardware", it's literally "firm" as in between "soft" and "hard".
I am a professional firmware developer.
It's ok, we all need a wetware update every so often
I don't believe any Samsung device has fully open source firmware. I assume you mean software seeing as you mention LineageOS?
I dont think there is any phone with open source Firmware. Even Laptops with Coreboot contain blobs most often.
The pinephone might, not sure
also samsung fabket performance is much better without all the bloatware. Same with my xiaomi phone. OS type is lineageos
I had a Xiaomi with Lineage OS for MicroG I would nust use it to communicate and organize my schedule while tying to make the cleanes interface. Ive been trying to get Carbon OS in my hand but I do not have any device that supports it.
I have the same tablet and OS (and apps, but I use aurora store as well). I am not happy that the fingerprint sensor doesn't work, but other than that is great.
I use it as reader, media player, some school apps of my kids.
I've used it (with a Bluetooth keyboard) as remote desktop client.
Sometimes web browsing but not really much.
Pixel 7 with Calyx OS. This is probably my all time favorite setup for a phone. Most of my apps are foss except a few (banking apps, discord, lyft, and Instagram)
Firmware is foss?????
PlayStore if you want to have it. Not everyone wants to have Google sniffing on your background just like Graphene with their "playservices"... Which is indeed Google with just a few options off. But people will never be able to get it pass their heads. Op is asking about open source... Not Google source