Analysis of XT4 Firmware (V3.0.2-EN.bin) - Font System Deep Dive

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.

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Lakafior