I can only recommend a Kindle. I used a Kindle 4 (with buttons), then a PW2 first with Coolreader and then with KOreader. It just always worked. No problems, battery lasted forever.
The last two years I had an Onyx Poke 2. There were minor problems every now and then. The battery died after two years. Then I tried a Pocketbook Era, quite good, but not quite seamless. The start on the sleep mode took a long time. And the device weighs a lot.
So I bought a Kindle Oasis 3. Fantastic, Koreader works flawlessly. Super screen, light weight, quick start from sleep mode. Warm and cold light...
Amazon sells good hardware. If you can get one with appropriate firmware, I can fully recommend.
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