Xteink's pocket e-readers get Libby and Kobo books through community firmware plug-ins

The team behind CrossPoint Reader, a free replacement firmware for Xteink's X3, X4 and X4 Pro pocket e-readers, has added support for third-party plug-ins, and one of the first community plug-ins lets those devices open DRM-protected ebooks borrowed through OverDrive's Libby or bought from stores such as Kobo's ^[1][2]. Until now the trade-off with Xteink hardware was that you sourced your own DRM-free files, while a Kindle or Kobo buyer gets tens of thousands of titles from an integrated store ^[3].

The plug-in, called Protected Content, runs through CrossPoint Reader's built-in web server and opens ebooks protected by Adobe Digital Editions DRM ^[7]. The install path is unglamorous but short: flash the firmware from a browser over USB-C using the CrossPoint Reader site, then unzip the Plugin Store onto the microSD card, which adds a Plugins section to the homescreen ^[6]. Authorisation needs a free ByteBooks account, or an old Adobe Digital Editions account converted over ^[8], and the borrowing still happens elsewhere, because Libby has to run on another device signed in with a library card ^[9]. The e-readers use low-power ESP32 processors, so searching or downloading from Libby on the device itself is not possible ^[10].

What moves between the two halves is an ACSM file. Libby hands you a small ACSM rather than the book; copy it to the microSD card and the plug-in fetches the EPUB and copies it to the device, readable for as long as the loan allows ^[11]. Kobo purchases work the same way, with the ACSM pulled from Kobo's website rather than its desktop app ^[12]. Amazon does not use EPUB with Adobe's DRM, so Kindle purchases stay outside the workflow ^[13].

The consequence is uneven rather than general. Any store that ships EPUB wrapped in Adobe's DRM is now reachable from hardware with no bookstore of its own, which in practice means library loans through Libby and Kobo purchases, while Amazon's format keeps its catalogue closed ^[16]. What gets commoditised here is Kobo's content access, not Amazon's. It is also not a like-for-like substitute: The Verge's reviewer, testing on an X4 Pro, describes the plug-in route as less streamlined than Libby's mobile app or Kobo's native OverDrive support, though easier than expected ^[5], and the functionality is still in beta even though it is now open to anyone ^[4]. A companion app, Common Stacks, removes most of the manual steps, covering Android, Windows and macOS with iOS said to be coming, offering full Libby access plus self-hosted libraries, and sending files to the e-reader in a couple of clicks while relying on the same CrossPoint web server in the back end ^[14].

Three things are worth tracking. Whether ByteBooks authorisation remains available to unofficial reading software, since the entire chain depends on that login ^[8]. Whether Common Stacks ships the promised iOS support, which is the difference between a desktop chore and a phone-to-device handoff ^[14]. And whether the Plugin Store, currently stocked with a few tools, attracts enough contributions to make plug-ins a durable feature rather than one clever workaround ^[15].