# Proxmark3 v4.20469 "Daddy Iceman" Released

> Major iCLASS legrec/legbrute speedups with multithreading, glitching simulation modes for key and SIO blocks, a new ST25TB tear-off standalone mode, and smarter card-technology detection across the client.

_2025-06-16_

Version **4.20469**, nicknamed **"Daddy Iceman"**, of the [Iceman fork](https://github.com/RfidResearchGroup/proxmark3) of the Proxmark3 is released. This release focuses on dramatic iCLASS recovery performance gains and better cross-card technology detection, with new standalone modes and fixes for Proxmark 3, RDV4 and iCopy-X users.

## Highlights
- `hf iclass legrec` saw large performance work: code optimizations delivered roughly a 147% speed increase, plus a `--fast` option (with automated AA2 block selection) and a `--sl` option that tweaks communication delays for further gains.
- `hf iclass legbrute` gained multithreading support, substantially cutting brute-force time on the 40-bit keyspace.
- New iCLASS glitching simulations: `hf iclass sim -t 6` glitches the SIO block and `hf iclass sim -t 7` glitches key block responses, useful for downgrade and recovery research.
- `hf iclass trbl` was renamed to `hf iclass tear` and now has a device-side implementation, with readability improvements and correct credit-key handling for partial tear-off results.
- New `HF_ST25_TEAROFF` standalone mode stores and restores ST25TB tags with tear-off for counters, runnable without a host.
- Card-technology detection was refactored across the client: `hf 14a info` and `hf mf info` now detect and report when a different card technology is present, and `hf mf autopwn` exits on DESFire and limits attacks on MIFARE Plus.
- New `hf_mfu_ultra.lua` script restores dumps to ULTRA/UL-5 tags and clears previously written ULTRA tags.
- Added the new PM3ULTIMATE platform to the build and docs, including FPGA compilation support.

## Contributors
This release landed thanks to [@antiklesys](https://github.com/antiklesys), [@iceman1001](https://github.com/iceman1001), [@doegox](https://github.com/doegox), [@n-hutton](https://github.com/n-hutton), [@seclabz](https://github.com/seclabz), [@mak-42](https://github.com/mak-42), [@sup3rgiu](https://github.com/sup3rgiu), [@BIOS9](https://github.com/BIOS9), [@rfidgeek1337](https://github.com/rfidgeek1337), and others.

Read the [full changelog and downloads on GitHub](https://github.com/RfidResearchGroup/proxmark3/releases/tag/v4.20469).