OpenReader

OpenReader is the first direct replacement for KindleOS on Kindle e-readers.

OpenReader is a proformance-first, barebones OS built from the ground up to revive your old e-reader and reclaim your hardware ownership.

Kindle devices don't alow for users to outright own their books. Books are normally accuired by renting licenses from Amazon. OpenReader not only allows for direct PDF storage, it also cuts the idle RAM usage in half - idling at ~170mb. Memory efficency is especially important on legacy hardware where many of these devices would otherwise be borderline unusable with stock Amazon firmware.

This was designed as a simple app launcher, with a full-featured settings menu, and portable touch controls. Touch calibration was completely rebuilt and designed to work across any kindle device. It installs as a KUAL extension with a precompiled touch binary and recovery paths if boot replacement needs to be undone. Users can choose to either suspend the stock firmware, or replace KindleOS entirely.

To my knowledge, this is the first and only project to fully replace KindleOS.