Endless OS 5.1, released on November 30, 2023, is a minor update focused on introducing Endless Key, an educational app with carefully curated resources for extended learning. The release also includes updated hardware support, improvements for Raspberry Pi compatibility, and various incremental enhancements. However, due to startup issues on some computers, upgrades to version 5.1.0 are temporarily disabled, with a plan to release version 5.1.1 to address the issue. The update features an improved integration of Endless Key, updated Linux kernel and NVIDIA graphics driver, and enhanced firmware packages for newer hardware. Additionally, the release removes outdated apps like Hack, Brasero, and Adblock Plus, replacing them with curated game development tools and suggesting alternative options for CD/DVD burning and ad-blocking. Various improvements, security updates, and bug fixes have been implemented, making Endless OS 5.1 a more refined and sustainable user experience.