Turn your ColdCard Q to Handheld Console with Costume Firmware (opensource)

I turned a Coldcard Q hardware wallet into a pocket arcade. QUASAR is free, open-source custom firmware for the Coldcard Q with three games: PAC-MAN (rebuilt in neon, with a new NEON mode), TETRIS (modern rules) and QUASAR, a shoot-'em-up with five boss fights. This video explains what it is, how it's built, how it's signed, how to install it safely, and how to go back to the official firmware. ⏱ CHAPTERS 0:00 Insert coin: what if your Bitcoin wallet played Pac-Man? 0:31 Level 1 · The hardware (Coldcard Q) 1:08 Level 2 · What is firmware? (the bootloader "bouncer") 1:53 Level 3 · What is QUASAR? 2:41 Level 4 · How it's made 3:58 Level 5 · Boss fight: how it's signed 5:15 Bonus stage · Staying safe 6:10 Level 6 · Install speedrun (step by step) 7:35 Level 7 · Let's play: controls 8:52 Continue? Going back to the official firmware 9:24 Game over: links 🕹 INSTALL IN 5 STEPS 1. Put the official Coldcard Q firmware on a microSD card first. Label it: official. 2. Download quasar-1.4.0-q1.dfu and check its SHA-256 (Mac/Linux: shasum -a 256 FILE · Windows: certutil -hashfile FILE SHA256). 3. Copy it to the top level of a microSD card and insert it. 4. On the Coldcard: Advanced/Tools → Upgrade Firmware → From MicroSD → pick the file → OK. 5. Wait out the ~25-second "unofficial firmware" warning, and play. Going back: in QUASAR choose System → Install Firmware (or hold S while switching on), pick the official file, enter your MAIN PIN. ⚠️ STAY SAFE • QUASAR has no wallet code: no seed words, no signing. It never reads the secure elements. • Try it on a spare Coldcard if you can. If yours ever held real money, set a fresh PIN first. • Never type your real wallet PIN into firmware you haven't checked yourself. • When installing from QUASAR, only use your MAIN PIN. A trick PIN there makes the bootloader wipe the seed. • QUASAR is signed with the public developer key (#0), so the Coldcard shows a warning at every start-up. That's expected, and it can't be skipped. QUASAR is an independent fan project, not made or endorsed by Coinkite. Coldcard is a trademark of Coinkite Inc. PAC-MAN and TETRIS are trademarks of their respective owners. All gameplay was recorded from the project's simulator, pixel for pixel. Music and sound effects are procedurally generated chiptune. Narration uses a synthetic voice. #Coldcard #Bitcoin #PacMan #Tetris #CustomFirmware #HardwareWallet #RetroGaming