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Documentation of my findings analyzing OTA file. My goal was to extract system fonts and try to re-implement external non monospaced fonts like system ones. During that I've managed to extract .bin into blocks of system images. Unfortunately I came to a wall and my current hypothesis is that system fonts are using some internal functions we can't properly use for external fonts. Further investigation is needed, as maybe we could prepare OTA file that can pass new font as internal one, which would allow us to use fonts like Bookerly as system ones.

This is documentation of my tries of getting into system files. My first try was on English 3.0.2 OTA which I assume is encrypted and hard to work with. This time I was trying to do it on Chinese version from this hub which seems unencrypted and easier to "unpack" and cut into partition segments. I've managed to do that, but because of lack of variables and documentations in those partitions, I think it would need now to be manually de-assembled. I leave all of my findings in hope someone more competent would find this useful for his own purposes.

This guide provides the essential information for optimizing content for the XTeInk X4's 480×800 e-ink display. The key priorities are proper image sizing, file weight management, and understanding the device's formatting limitations.

A simple guide to optimize any epub for Xteink X4 (including drm removal)

I have compiled a guide on how to flash, backup, and update firmware. The more advanced commands are linux-based, but you shouldn't need those to do a basic flash/backup. https://github.com/Joseph-Cannaday/xteink_x4-english

Comprehensive user manual for the XTeink X4, covering setup, features, and troubleshooting.