I honestly don't know any manga reader that does that, particularly considering that upscaling is relatively intensive. What about getting an old Samsung tablet with a 2084x1536 resolution? A Galaxy Tab S5 nowadays is quite cheap and still powerful enough.
this post was submitted on 15 Jul 2023
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Alright, thanks, I'm not sure what I'm going to do but I'll see.
No worries!
Unless you want to mess around with something like this, your current best option is probably to manually upscale things yourself using something like waifu2x and then repack everything into your own .CBZ
archives.