SeedHammer II manual

Power, firmware, seed entry, descriptor transfer over NFC, plates, recovery, troubleshooting. Firmware v1.4.3.

• Power supply and first startThe USB-C supply and cable the SeedHammer II needs, what it does when it gets power, and what the start screen offers.
• Firmware UpgradeInstall a SeedHammer II firmware release from a computer or an Android phone, with or without the firmware button.
• What the SH II does and does not doInputs, formats, scripts, plates and limits of the SeedHammer II on stock firmware v1.4.3.
• Enter a seed on the touchscreenType a 12 or 24-word BIP39 seed on the SeedHammer II, check it and engrave it on a plate.
• Send a descriptor to the SH II with NFC Tools (iPhone and Android)Write a wallet descriptor from a phone to the SeedHammer II over NFC and fix a failed transfer.
• Descriptor export from Sparrow and Specter (desktop)Pick the Sparrow Wallet or Specter Desktop export the SeedHammer II reads, move it from the computer to a phone, and send it to the machine.
• Descriptor export from phone wallets (Cove, Nunchuk, BlueWallet and others)Copy the wallet descriptor out of a phone wallet, send it to the SeedHammer II with NFC Tools on the same phone, and know which exports the machine accepts.
• Send a descriptor from Coldcard Mk4 or Q over NFCTap a Coldcard Mk4 or Q on the SeedHammer II to send a wallet descriptor, choose the Coldcard export the machine reads, and fix a failed transfer.
• What fits on a plate, and multisig without shardingBack up a multisig wallet on the SH II, one plate per seed and the descriptor where you choose.
• Titles and what is engraved on a plateWhat the SeedHammer II engraves on each plate, where a wallet title appears, and how to tell plates apart.
• Plates: which fit, specs and durabilityWhich plates the SeedHammer II takes, what the official plates are made of, and what to expect from other plates.
• Recover a wallet from the platesRead SeedHammer II plates back into a wallet, restore the signers, and rehearse it.
• Troubleshooting: errors and symptomsWhat each message and fault on the SeedHammer II means, and what to do about it.
• Engraving quality and mechanicsHow deep the SeedHammer II engraves, how to test a job, and what to tighten when text is faded.
• Hardware, spare parts and self-buildsWhat wears on the SeedHammer II, where spare parts come from, and what the open hardware files contain.
• Security model: short FAQWhat the SeedHammer II keeps, what can leave it, which firmware it runs, and how to handle seeds, descriptors and plates.

Agents

/llms.txt, /llms-full.txt, raw markdown under /raw/. Never paste seed words into a chat assistant.