I jailbroke my old Kindle, but I found a safer way to add books - for free

ZDNET's article explains how to extend the life of older Kindle and Fire devices by jailbreaking to install third-party software (like KUAL and KOReader) or by sideloading ebooks via USB. It provides step-by-step guidance to identify model/firmware, acquire and install jailbreak packages, and highlights drawbacks and risks (device instability, reduced battery life, potential legal/DRM issues), ultimately recommending USB sideloading as the safer option.