BOOX Note Air 4 C · KOReader
Install KOReader on the BOOX Note Air 4 C
Install KOReader from the Play Store or an APK on the Note Air 4 C, then set its BOOX refresh mode and grant storage access. No jailbreak.
On the Note Air 4 C, KOReader installs like any Android app — from the Play Store or an APK, no jailbreak. The two things that make it look right are granting full file access so it can find your books, and letting KOReader manage e-ink refresh itself in black-and-white rather than through BOOX’s per-app colour system. Keep NeoReader or BOOX Notes for anything involving the pen.
Before you begin
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Install KOReader
Open the Play Store, search for "KOReader", and install it. If you prefer not to use Google, download the "koreader-android" APK from the KOReader releases page in the device's browser and open it to install; allow "install unknown apps" for the browser when prompted.
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Open KOReader and grant file access
Launch KOReader. On first run it asks for permission to access storage — grant it, and if Android shows an "all files access" toggle for KOReader, turn that on too. Without it, KOReader cannot see books outside its own folder.
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Point KOReader at your books folder
In KOReader, open the file browser (top-left menu) and navigate to where your books are — "Books" or "Download" in internal storage, or the microSD card. Long-press a folder and "Set as home directory".
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Set KOReader's BOOX refresh mode
Leave KOReader, open its BOOX optimisation panel, set its refresh mode to HD or Regal, and set it to black-and-white — colour adds nothing for plain text and softens it. Turn off any BOOX "app-level full refresh" — KOReader manages its own.
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Set KOReader's own refresh inside the app
Back in KOReader, open the top menu, then the gear, then "Screen", and set "full refresh every N pages" (every 1 page is cleanest, every 6 is a compromise). This is the setting to use, not BOOX's.
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Optional — tune gestures for the big screen
In KOReader's "Taps and gestures", widen the page-turn tap zones and set a multi-swipe or corner gesture for the table of contents, since your thumb does not reach the far edge of a 10.3-inch screen one-handed.