SLIP-39 Mnemonics can be used directly on a Trezor "Model T" to
backup/restore the Seed.

Also supports other Hardware Wallets that require a BIP-39 Mnemonic for
Seed recovery, such as to your Ledger Nano.  Recover your BIP-39 Seed
Phrase from these SLIP-39 cards using the GUI (or command-line) whenever
you need it, to restore your Crypto accounts to your hardware wallet.

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 Controls  Description                                                         
───────────────────────────────────────────────────────────────────────────────
 Backup    Already using a BIP-39 Seed Phrase? Back it up using SLIP-39 Cards  
 Create    Generate SLIP-39 Cards, even if using a BIP-39 hardware wallet      
 Recover   Use SLIP-39/BIP-39 to recover Seed, supports using BIP-39 on wallet 
 Pro       Convert existing BIP-39 Seed to SLIP-39 for "Paper Wallet" backup   
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1 Using BIP-39
══════════════

  To support older or less expensive existing hardware wallets that
  *only* support BIP-39 recovery, *or* to backup existing BIP-39
  Mnemonic phrases to SLIP-39 (to avoid moving all of your old BIP-39
  Seed derived wallets to new SLIP-39 Seed derived wallets), click the
  "Using BIP-39" checkbox (this is the default). This will do two
  things:


1.1 Output BIP-39 Mnemonics
───────────────────────────

  You will see your BIP-39 Mnemonic, which encodes the Seed Source (and
  optionally any Seed Extra Randomness) you've specified.

  We'll even include one BIP-39 card in the output PDF.  You can store
  this card (very safely and securely), but we recommend you destroy it,
  and instead use the SLIP-39 App with your SLIP-39 Mnemonic Cards to
  recover the BIP-39 Mnemonic phrase when needed.


1.2 Use BIP-39 Seed Generation
──────────────────────────────

  Any Cryptocurrency wallet QR codes and Paper Wallets will be derived
  using standard BIP-39 Seed generation.

  Since BIP-39 uses the Seed Entropy *differently* than SLIP-39 does,
  this produces *different* wallets in the hardware wallet device!  In
  other words, exactly the same 128- or 256-bit entropy produces
  different wallets in a [Trezor "Model T"] recovered directly from
  SLIP-39 Mnemonics, compared to the same Trezor or [Ledger Nano X]
  recovered from BIP-39.

  This is usually not a problem: just ensure that if you're intending to
  use a hardware wallet that natively supports SLIP-39 (like the Trezor
  "Model T"), *do not select* "Using BIP-39".  Then, the QR codes and
  Paper Wallets printed will match those produced in the hardware wallet
  after SLIP-39 recovery.

  If your hardware wallet only supports BIP-39 (or you're just backing
  up the Seed Entropy of an existing BIP-39 Mnemonic using SLIP-39, and
  you want to continue using the original BIP-39 wallets), then *do
  select* "Using BIP-39".  Then, when you recover your Trezor or Ledger
  from BIP-39, the printed QR codes and Paper Wallets will use the
  BIP-39 Seed generation standard, and will match those produced in the
  hardware after BIP-39 recovery.


[Trezor "Model T"]
<https://shop.trezor.io/product/trezor-model-t?offer_id=15&aff_id=10388>

[Ledger Nano X]
<https://shop.ledger.com/pages/ledger-nano-x?r=2cd1cb6ae51f>
