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How to Read and Annotate EPUB Files on Supernote A5X2 (2026 Guide)

The Supernote A5X2 is Ratta's flagship 10.2-inch E Ink note-taking device — successor to the popular A5X. It combines native EPUB, PDF, and DOCX reading with deep stylus annotation, a ceramic-tip pen with paper-like feel, and the Supernote Cloud for wireless sync. Unlike Android-based BOOX devices, the Supernote runs a focused, distraction-free OS optimised for reading and handwriting rather than general app use.

Supernote A5X2: Key Specs

Specification	Detail
Display	10.2-inch E Ink Carta, 226 ppi
OS	Supernote OS (custom, distraction-free — not Android)
Storage	32 GB internal
Stylus	Ceramic-tip Heart of Metal stylus — no battery, no charging
Native EPUB support	Yes (EPUB, EPUB3, PDF, DOCX, TXT)
Connectivity	USB-C, Wi-Fi
Cloud	Supernote Cloud with automatic backup and sync

Transfer Methods

Method	Best For	How
USB-C cable	Bulk transfers, large files	Connect to PC/Mac, copy EPUB files to the Document folder
Supernote Cloud	Wireless sync and backup	Upload EPUB at supernote.com; sync to device automatically over Wi-Fi
Supernote desktop app	Wi-Fi transfer without USB	Use the Supernote Partner app on PC/Mac to share files over local Wi-Fi
Email to device	Single file quick sends	Email EPUB attachment to your device's Supernote email address

Annotation and Reading Workflows

Ceramic-tip stylus: The Heart of Metal stylus has no battery and no charging — it is always ready. The ceramic tip provides a distinctive friction that mimics writing on paper more closely than most competing styluses.
EPUB annotation: Highlight text, add typed or handwritten margin notes, and bookmark pages. All annotations are linked to the text position, not a fixed page coordinate, so they survive font-size changes.
Digest export: Export all highlights and notes from an EPUB as a Digest PDF — a compiled summary document useful for review and sharing.
Focus-first OS: Unlike Android BOOX devices, the Supernote OS has no notification system, no social apps, and no app store — designed to eliminate distraction during reading sessions.
Star links: Bookmark and cross-reference passages across multiple documents using Supernote's star link system for connected note-taking.

FAQ

Does the Supernote A5X2 support EPUB natively?

Yes. The Supernote A5X2 supports EPUB natively in the built-in reader app, along with PDF, DOCX, EPUB3, and TXT files. No conversion is required for DRM-free EPUB files.

What makes the Supernote A5X2 different from the A5X?

The A5X2 is the successor to the A5X with a faster processor, improved E Ink display, and updated firmware with new annotation features. The ceramic-tip stylus and overall reading experience remain similar to the A5X, which was already praised for its near-paper writing feel.

How do I transfer EPUB files to the Supernote A5X2?

Connect via USB-C to copy files directly, or use the Supernote Cloud (supernote.com/account) to sync files wirelessly. You can also share EPUBs from your computer directly over Wi-Fi using the Supernote desktop app, or email files to your device's Supernote email address.

Can I annotate EPUBs with the stylus on the Supernote A5X2?

Yes. The A5X2 supports handwritten annotations on EPUB and PDF pages using the ceramic-tip stylus, which has a distinctive paper-like friction. You can add typed notes, highlights, and bookmarks as well. All annotations are stored in the document and can be exported.

How do I convert PDFs to EPUB for the Supernote A5X2?

Use toolkit.bot to convert your PDF to EPUB for a reflowable reading experience. The A5X2 also reads PDFs natively with pan/zoom and a reflow mode, but EPUB gives you better font control and integration with the reader's annotation tools.