I'm looking to buy my first e-reader. I plan to buy something used off eBay, like I do when I need a new cellphone. When I get a new phone, the first thing I do is unlock the bootloader and load a custom ROM on it. I thought some e-readers were similar, where you can load a whole custom ROM on the device, and never be forced to use the stock software. It seems, I've gotten that wrong. It seems like most people with a "hacked" e-reader are simply using an app called KOreader, which runs inside the regular factory stock operating system. I guess I'll do that if I have to, but I'm wondering is there any paperwhite e-reader that has a fully custom ROM made for it? I'd like to replace the stock firmware entirely. Any hardware recommendations? Or should I just bite the bullet, get a Kobo Clara HD, and put KOreader on it?