# Proxmark3 v4.18994 "Backdoor" Released

> The Backdoor release introduces tooling for FM11RF08S static encrypted nonce cards, a rewritten HF MattyRun standalone mode, and an extended MIFARE authentication command set.

_2024-09-10_

Version 4.18994 "Backdoor" of the [Iceman fork](https://github.com/RfidResearchGroup/proxmark3) of the Proxmark3 firmware and client is available. This release adds dedicated tooling for the FM11RF08S backdoor, a major standalone mode rewrite, and many MIFARE and iClass improvements.

## Highlights
- Added several new tools to tackle FM11RF08S cards, including `hf mf isen` for analyzing static encrypted nonces, with support for `n=0` first-auth capture, nt indexes, and per-sector increment options.
- Rewrote the HF MattyRun standalone mode, which now loads additional user-defined keys from emulator memory and fixes partial emulation state display and LED signalling.
- Added extended authentication support to `hf mf rdbl`, `wrbl`, `rdsc`, and `nested`, so cards using extended AUTH can be read and written.
- Changed `hf mf fchk` to allow cracking a single key with live progress reporting, improving feedback during long key checks.
- Implemented a VB6 RNG for iClass elite key search in `hf iclass chk` and lookup, based on the Flipper Zero Picopass implementation, with `--ns` no-save support added to `hf iclass dump`.
- Fixed ISO 14443-B tag simulation, correcting reversed bit coding and PICC state machine handling so emulated Type B tags can be read reliably.
- Fixed `mf_nonce_brute` so it searches the full keyspace and tracks candidate counts, avoiding false positives from valid-looking decrypts.
- Added native output grabbing for Python and Lua, a cleaner replacement for the previous output_grabber.py approach that also works on ProxSpace.

## Contributors
This release landed thanks to [@iceman1001](https://github.com/iceman1001), [@doegox](https://github.com/doegox), [@ry4000](https://github.com/ry4000), [@douniwan5788](https://github.com/douniwan5788), [@Antiklesys](https://github.com/Antiklesys), [@michaelroland](https://github.com/michaelroland), [@CiRIP](https://github.com/CiRIP), [@dandri](https://github.com/dandri), [@micsen](https://github.com/micsen), [@gentilkiwi](https://github.com/gentilkiwi), [@jmichelp](https://github.com/jmichelp), [@bettse](https://github.com/bettse), and others.

Read the [full changelog and downloads on GitHub](https://github.com/RfidResearchGroup/proxmark3/releases/tag/v4.18994).