I appreciate your reply!
What’s the best way to create an offline device???
For me, it’s as simple as never connecting it to WiFi. 
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I appreciate your reply!
I wish it was this easy but literally every company seems to be pushing cloud functionality as a core advantage to their apps…
I’d love to buy a hardware ebook reader device that only functioned as an offline device. I feel like I need to time travel back to the 1990’s to get this kind of feature set… 
This is why before buying, consider if all of your needs might be filled without ever connection to the Internet.
With the right reader, might definitely be more than enough sticking to offline-only.
What do you feel is missing if not connecting online?
Dictionary? Sync?
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I appreciate your reply!
To be honest I have no need for a dictionary or any online syncing features. I still can’t find a device that works exclusively offline…
The other thing that scares me a great deal is storing ebooks in the cloud and then having those ebooks changed in some way by the cloud company that’s hosting the ebooks.
This happens all the time:
" Ebooks can be altered by hosting companies or distributors , often without the author’s or reader’s knowledge, because digital content is typically licensed rather than owned. Platforms like Amazon Kindle and Google Play Books have the technical and legal ability to retroactively modify or delete ebooks from users’ libraries, as seen in cases involving works by Agatha Christie and R.L. Stine , where offensive content was edited post-publication."
As suggested previously here, if you have a decent e-reader and use it offline-only, it’s simply a matter of dropping an .epub, .pdf (or whatever your favorite file) on an SD card and you’re done.
Nobody will known nor intercept it from you. 
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I have got a Basic Lux 4, but I would choose a newer model if I need a new one.
On setup it asks for online login, but you can skip that. It supports many ebook formats and system updates can be done fully offline by moving a zip file to local storage.
I also suggest looking into Anna’s archive for free ebooks, if your local laws allow.
Kobo, PocketBook and tolino are all okay ebook readers for privacy and can be operated 100% offline.
If you want to buy an e-book reader I would recommend one of them.
Kobo for now seems to have the better hardware compared to Pocketbook and tolino is basically a rebranded Kobo.
Airplane mode is regulated by law in the EU, China, etc… it turns of all radio signals like WiFi and bluetooth.
So really, just buy any device and once it’s set up put it in Airplane mode and you’re set. No extra software needed.
If companies want their phones on airlines, and they do, they need to comply with this.
Also, if you want to take a less air tight route, I personally have a kindle with koreader that I’ve blocked internet access to from my router, I then send epubs over with the LocalSend plugin wirelessly over my local network.
Nothing prevents an app or an ereader from transmitting accumulated telemetry and usage data once the connection is reestablished, which is what Kindle does afaik, so using something that doesn’t gobble up your data or can’t connect to the internet goes a long way
Last I checked unless you’re building the device by hand, which you can do, no e-reader comes without WiFi. Although, if I’m wrong please do correct me as I’d love to now about such a device.
Honestly, just don’t connect it to the internet ever then or if you need to for the setup, use a temporary hotspot or guest network and leave it in airplane mode after.
For most things this is enough for me, but I understand everyone has their own threat model.
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My point was that it’s better to use something that doesn’t collect lots of telemetry and usage data and keep it offline, rather than use something like this and try to work around it by never connecting it to the internet. Someone might have reasons to connect to the internet at least once or twice, either because they want extra functionality or for some other reason. When they do, it’s better if the device doesn’t transmit data they don’t want it to