@Edent As an aside, I'm also a retro-ereader user - Sony PR-505 inspired by a post from @ifixcoinops I think. With the last available firmware it manages ePubs OK so long as the embedded graphics aren't so big they exceed the available memory.

I think that £8 device was more of a e-ink photo frame wasn't it? The ebook library was on the phone which converted them to graphic images and sent them over bluetooth - seems inefficient just to keep the device cost down.