# Proxmark3 v4.21128 "Permafrost" Released

> Broad MIFARE Ultralight AES support across `hf mfu`, a new UL-C/UL-AES unlocker standalone mode, a unified `hf mf keygen` with multiple KDFs, SEOS write/sim commands, and in-client QR code generation.

_2026-02-25_

Version **4.21128**, nicknamed **"Permafrost"**, of the [Iceman fork](https://github.com/RfidResearchGroup/proxmark3) of the Proxmark3 is released. The headline theme is full MIFARE Ultralight AES support across the client, alongside a consolidated key generation command, expanded SEOS tooling, and quality-of-life additions for Proxmark 3, RDV4 and iCopy-X users.

## Highlights
- Ultralight AES support was added throughout `hf mfu info`/`rdbl`/`wrbl`/`dump`/`ndefread`/`wipe`/`setkey`, covering both UL-AES authentication and secure messaging, plus basic DataProtKey emulation and `hf 14a raw` secure messaging.
- New standalone mode `HF_DOEGOX_AUTH0` acts as a UL-C / UL-AES unlocker, letting the device crack these tags without a host.
- `hf mf bambukeys` was replaced by a unified `hf mf keygen` command with multiple KDFs, including a new Snapmaker U1 filament spool KDF, so vendor key derivation lives in one place.
- New `hf seos write` and `hf seos sim` commands enable writing and simulating SEOS credentials; SEOS ADF/PACS handling was also fixed for cards with different diversifier lengths and ADF OIDs.
- New `data qrcode` command generates QR codes directly inside the client, and NDEF/Open print tag records are now identified.
- ATR fingerprinting was added to `hf 14a`/`hf 14b info`, improving smartcard identification.
- Added support for importing Bruce dump files (`.rfid`) and the Verkada 40-bit and Kaba evolo formats, broadening interoperability.
- `hf 14b config` was added with polling-loop annotation support, along with better ECP configuration aliases.

## Contributors
This release landed thanks to [@iceman1001](https://github.com/iceman1001), [@doegox](https://github.com/doegox), [@kormax](https://github.com/kormax), [@Foxushka](https://github.com/Foxushka), [@nvx](https://github.com/nvx), [@aaronjamt](https://github.com/aaronjamt), [@team-orangeBlue](https://github.com/team-orangeBlue), [@xianglin1998](https://github.com/xianglin1998), [@merlokk](https://github.com/merlokk), [@aaronmaxlevy](https://github.com/aaronmaxlevy), and others.

Read the [full changelog and downloads on GitHub](https://github.com/RfidResearchGroup/proxmark3/releases/tag/v4.21128).