I am looking for an e reader with specific features, honestly I don't know if what I want even exists, but I figured this might be a good place to ask. Here's my wants:

• Charge via USB-C
• Open, allows .epub files (I understand some brands don't)
• interfaces with Calibre
• Does not have any wireless radios ie bluetooth, wifi (I know lots of people would say just turn those features off, but I would just prefer the device doesn't have them to begin with)

Have you guys seen any devices that meet this criteria?

So for various reasons I can't use paper books very well. I've been reading almost exclusively on epaper for... 15 years or so now?

My current reader is a Kobo Aura One which has done very well but is starting to get a bit tired - the screen is a bit scratched up and the battery life is measured in days rather than weeks (at around 1hr/day reading with the frontlight on low). Plus the usb socket has done that annoying thing where the cable needs to be at the exact right angle in order to charge.

So I'm in the market for a new one. I'd like it to be >7 inches, 300ppi (same spec as the Aura One or better). Overdrive support is nice but not essential. EPub support is a must, as is orange/red frontlighting. Linux slightly preferred over Android. Battery life in weeks. Waterproof doesn't matter. Cloud sync, bluetooth, audiobook support, apps (other than a decent reader), note-taking - I don't care about. It's for reading books, nothing else. Budget is not a huge issue but I don't want to spend more than I have to.

I have had zero time for the last few weeks to look into what the market is doing now and it's been many since I paid much attention to the world of ereaders, so anyone who is more up to date than me who can offer some suggestions would be much appreciated.

I started studying again this semester, and have to read a lot of stuff because of it.
As we get nearly all our Books as PDF and reading on my notebook or my phone gets tiering quite fast. So I'm thinking about getting myself an e-reader to make things go easier.

So i tried to find some ressources to learn about e-readers, but the internet (or search engines) these days seem to suck.
So maybe my lovely tildes can help.

must haves:
can read PDF
needs to make reading this "shitty" two colums pages my PDF have good and easy

nice to haves:
FOSS
Backlight

can somebody help me out? or do you know about a resource where I can learn about the pro and cons of the different e-readers, I'm starting with close to 0 knowlege as I never thoght I will need one, I generally prefere to read proper books.