if you want to jailbreak it, there’s a spreadsheet somewhere detailing which models to avoid

but honestly, before i figured out i could jailbreak mine, i was just using it in airplane mode 24/7 and transferring stuff over usb with the EXCELLENT software Calibre. highly highly recommend! the only benefit i get from the jailbreak is that i can use a more customizable reader (fonts, margins, night mode), and that i can now transfer stuff from Calibre over wi-fi without having to create an amazon account. bliss!