The user created custom firmware for the Xteink ereader, and is requesting PDF support as a feature.
I need to give props to CidVonHighwind on GitHub for laying the foundation with their sample project. So I go this device last week. Love the hardware, software was not so great. So I did something about it. I still have ALOT of work to do, but I’ll have it on GitHub in a few weeks with full documentation and instructions. Let me know if there’s anything you’d like to see in the future! Library TXT and EPUB support (needs work) Chapter navigation Bookmarks Reading progress auto-save Adjustable font size, line spacing, margins Text justification Night mode Portrait/landscape orientation Library sorting Apps Clock Calendar Weather (5-day forecast)(needs work) News/RSS reader (needs work) Daily quotes Games Chess 2048 Connect 4 Minesweeper Snake Tic Tac Toe Blackjack Checkers Wordle Sudoku Word Search Yahtzee Tetris (needs work) Pac-Man (needs work) Tools Pomodoro timer Flashcards (CSV support) Spaced repetition (SM-2 algorithm) Calculator Sketch pad Notes (needs work) Unit converter Dice roller WiFi file transfer (browser-based) (needs work) Settings Display Reader settings Time & timezone (17 zones) Weather location (needs work) Power & auto-sleep WiFi manager (multi-network) System reset options System Lock-screen image shuffling On-screen keyboard Battery monitoring Deep sleep Screenshot (UP+BACK hold) Partial refresh for smooth UI WiFi on-demand Doesn’t work/can’t figure it out Web browser Screenshots (blank output - framebuffer inaccessible) GB/GBC emulator USB mass storage (S3 only) PDF support OTA updates Custom themes/fonts