Its running an older version of android, 4.4 KitKat and its massively stripped down with system apps. Keeps in lean, but fully functional. As a tinkerer and an enjoyer of digital books, this scratches an itch which jailbreaking didn't.
Read the PDF to get I good understanding of the processes involved. Also one of the tools is in Chinese but once a list of text is shown press 8, I saw someone in the thread pressed something else and bricked they're Kindle, but its all covered in the PDF guide.
I was pretty content with that too but then with one of the updates I had Amazon asking for registration and network connection every time I powered on. That and defaulting to store screen instead of my library. When I first got the pw3 this wasn't an issue.
If I had to buy an ereader I would buy something that is native android but my pw3 had been passed to me from my grandmother, which I cherish the device but I care deeply about privacy and freedom so hackdroid is a great middle ground.
I was running only arch on my surface pro 7 and my amd desktop, then last week after an update it seemed gnome and Linux surface kernel weren't playing nice and had bricked the install. I have switch the laptop to Debian but I tend to stick with arch, like op as I am used to it, I now run Debian as it is known to be stable.
I would love to find a new distro but for me its the sunk cost fallacy, I have put so much time into learning arch and to repeat all that - this new distro would need to offer something wildly different.
I would suggest looking up tailscales docs, its not massively complicated but I wouldn't do the process justice.
But the short of it: signup with tailscale. Add tailscales software to each device. Then from tailscales admin panel go to setting, VPN, mullvad, setup payment then add up to 5 devices to use mullvad as an exit node.
Install size has gone up, its sluggish on my surface pro 7, its constantly wanting to grab my attention to put towards their other products, windows 10 was bad as it seemed to be ms's first iteration of their now billboard, but at least I could offline install, make a local account and mostly be left alone. And windows 11 is aweful for its kiddy gloves.
For that I would go the route of any mini pc with ddwrt's development and an e-ink screen. More io, more affordable and much easier to develop on!