MicroPython on Flipper Zero

Original Article ↗ Hacker News Discussion ↗

Languages and Development on Flipper Zero

  • Question: for writing apps/plugins, what’s “better” – MicroPython, JavaScript, or native?
  • Reply: “Native” is effectively C/C++; expected to be fastest because it’s compiled and important on a microcontroller.
  • Recommendation: start with the language you already know for MVP; move to C if performance is insufficient.
  • Experience shared that integrating C into a MicroPython build (on similar hardware like RP2040) is straightforward.
  • Someone asks about VM memory footprints and crash robustness; no concrete comparative data is provided in the thread.

RFID / NFC, Employee Badges, and Limitations

  • “Employee badges” cover many technologies; first step is always to identify make/model and protocol.
  • Overview given:
    • 125 kHz LF: usually simple IDs, little/no security, often cloneable (e.g., T5577-based tags). Flipper handles these well.
    • 13.56 MHz HF: ISO14443/15693/EMV families, with subtypes like MIFARE Classic (broken crypto), Ultralight/NTAG (weak), DESFire and modern iCLASS (not broken / not supported by Flipper by default).
  • Flipper’s HF limitations:
    • Cannot do true on-chip emulation.
    • Clock not cleanly divisible by 13.56 MHz → timing/emulation are inherently limited.
    • Complex cracking (e.g., MIFARE) is CPU/memory intensive; Flipper mostly uses large key dictionaries and limited cracking.
  • More specialized tools (e.g., Proxmark clones) handle HF cracking and hardnested attacks better.

Car Keys, Rolling Codes, and EMV

  • Modern car keys often use rolling-code protocols; naive replay or cloning can:
    • Fail outright.
    • Desynchronize keys and vehicle, causing lockout.
  • Some firmware variants purportedly allow more aggressive key-related functionality, but:
    • Risk of breaking synchronization is emphasized.
    • Legal issues are repeatedly mentioned.
  • Discussion notes that some rolling-code schemes (e.g., Keeloq) are known to be breakable, but robustly designed systems should resist analysis from a few captured codes.
  • EMV contactless card emulation with Flipper is generally reported as not working; magstripe “MagSpoof”-style devices are mentioned as a different (and abuse-prone) category.

Real-World Uses vs. “Toy” Perception

  • Common practical uses reported:
    • Cloning/building keyfobs for gates, garages, apartment/office access.
    • Universal IR remote for TVs, AC units, fans, projectors, and home automation macros.
    • Debugging IR-controlled devices.
    • Using as a compact LF RFID reader in security work.
    • Capturing sub‑1 GHz RF remotes (garage doors, projector screens, fans) then reimplementing control with ESP32/CC1101, automation, etc.
    • Storing amiibo data; emulating some tags for game or pet-device setup.
  • More “playful” uses:
    • Turning off/on public TVs (“TV-B-Gone”-style).
    • Opening Tesla charge ports.
    • Experimenting with BLE/Wi‑Fi attack boards and HID attacks.
  • Many owners report that after initial excitement it mostly lives in a drawer; some explicitly call it a “toy” that’s rarely truly needed.
  • Others liken it to a multitool: seldom essential, but very satisfying when it solves a niche problem.

Firmware, Restrictions, and Third-Party Mods

  • Stock firmware is described as “locked down” for regulatory and legal reasons:
    • Certain RF bands disabled.
    • Some potentially sensitive features (e.g., car key emulation) restricted.
  • Users mention third-party firmware (e.g., variants that unlock frequencies or add offensive tooling) as easy to flash and more capable, but legally risky in some regions.
  • Some feel early firmware was later “nerfed,” reducing utility, though older firmware and community forks still exist.

Pet Microchips and Registries

  • Mixed results reading animal microchips; often requires careful positioning and patience, and sometimes fails where vet tools succeed.
  • The microchip registration ecosystem is characterized as fragmented, with:
    • Multiple registries, no single authority.
    • Difficulty updating owner data without fees in some cases.
  • Suggestions and thought experiments arise:
    • Cross-registry search tools.
    • Cryptographic or decentralized registry designs.
    • Directly storing contact data on chips is debated as inflexible vs. central IDs.