• 2WIRE
  • Intermediate
  • 5 min
  • Serial CLI

Recipe · Intermediate · 2WIRE

How to check SLE4442 PSC security status

Use the 2WIRE smartcard shell security check before trying PSC unlock, writes or protected memory operations.

SLE4442 smartcard inserted in a reader.
A practical ESP32 Bit Pirate workflow based on the documented firmware commands.
Step 1

Commands

Open the smartcard shell from 2WIRE mode, then choose Security check in the interactive menu.

Result

What it means

The card is responding well enough to inspect protection state before any unlock, write or protect action.

Troubleshooting

  • If security status cannot be read, go back to Probe first.
  • Check power quality and contacts.
  • Use a disposable lab card for write and unlock tests.

Next steps

  • Dump the card memory.
  • Only unlock with a known PSC.
  • Avoid protect actions until the workflow is fully understood.

SLE4442 security status FAQ

Why check PSC status before unlocking?

The PSC retry counter can be limited, and wrong attempts may permanently lock protected zones. A read-only security check gives the current state before any risky unlock action.

Is SLE4442 the same as I2C or ISO7816?

No. SLE44XX cards use a 2-Wire synchronous protocol in this workflow. Treat them as their own smartcard family, not as I2C EEPROMs or full ISO7816 cards.

What does a successful security-status read unlock in the workflow?

It confirms that the card is responding well enough to reason about PSC state, retry counters and later lab operations. Without a reliable status read, unlock or write tests are not meaningful.

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