YACPGitHub ↗OPEN-SOURCE FIRMWARE FOR XTEINK
YACP prioritizes battery life and responsive reading by limiting unnecessary work. Read your books, resume your page and adjust the text for each book.
EPUB · TXT · XTC / XTCH
Select firmware for your exact model. Pro and Classic builds are in beta preparation.
These are implementation choices behind the reading experience.
READING
Choose an interface below to see what it does.
Choose Quick Resume as your sleep screen. The current reading page stays visible while the reader sleeps, so you can still read it before waking the device to continue.
Quick Resume and sleep galleries are alternative sleep-screen choices. Reading statistics can be disabled in settings.
TEXT AND SETTINGS
Change the font, text size, spacing and other reading options without applying the same layout to every book.
Built-in fonts: Atkinson Hyperlegible Next and Lexend Deca. Add compatible fonts on the SD card. Adjust spacing, indentation, contrast and the reading status bar.
Standard: 12, 14 and 16 pt built-in sizes. XLarge: 16, 18 and 20 pt. These are the next-beta font sets.
Install a compatible CJK font on the SD card to display the characters used by your books. Supported title and author displays can use the same font.
CJK fonts are installed separately.
Display, Reader, Controls and System settings have separate subpages in the next beta. Use the relevant group to find an option or change settings from the web portal.
On X4 Pro, hold a word to open its definition. On readers with physical controls, select the word with the buttons.
The dictionary works offline and runs a lookup when you request it. Install a compatible dictionary on the SD card first.
SLEEP IMAGES
In gallery sleep mode, YACP selects an image at random from that book's gallery each time it sleeps. A general gallery serves as the fallback.
Use covers from different editions, illustrations or your own images. Select an example below to see the prepared grayscale image.
ADDED IN THE NEXT BETA
Search Open Library by title and author. Select the covers you want, adjust their crop and grayscale, then upload the selection to the book's gallery.
Search and image preparation use the browser on your phone or computer. Local image import is also available.
6 selected · 6 converted · 6 uploaded
Recorded result from the isolated simulator gallery. The edited walkthrough does not measure processing speed.
COMPATIBILITY
X3 and original X4 share a firmware family. X4 Classic and X4 Pro each require their own build.
STABLE RELEASE AVAILABLE
Physical controls and optional tilt page turning.
Standard or XLarge. Standard is recommended for most users.
View the X3 / original X4 release ↗Button mapping, long-press shortcuts and optional tilt controls.
Magic Flash for X3 or Classic refresh, according to the installed release.
Published stable 1.7.1 supports X3 and original X4. Classic and Pro builds shown here are part of the 1.9.0 beta 1 preparation. Check the release notes for hardware and font compatibility.
OTHER FUNCTIONS
Folders, recent books, cover grids, EPUB chapters, bookmarks and footnotes. Transfer files through the web portal, OPDS or Calibre wireless workflows. X4 Pro also supports USB drive mode.
Button mapping, separate long-press actions, orientation, automatic page turning and X3 tilt controls. X4 Pro adds touch, a Home key and frontlight adjustment.
Manual and supported automatic backup options preserve reading records. The current build also retains associated reading data during supported book moves and migrations. Back up the SD card before changing firmware.
Beta preparation preview. Firmware assets and final validation reports are not published on this page.
YACP is independent open-source firmware based on CrossPoint and FreeInk SDK, with earlier CrossInk contributions. Christophe has continued development since the last stable release.
A reader donated the X4 Pro used for development and testing. Thank you to that donor, the testers and upstream contributors.
Source code and issue tracker ↗