Ledger Flex and Stax in a Sparrow multisig

TL;DR

The Ledger Flex and Stax run the same Bitcoin app as the Nano S Plus, so a Sparrow multisig works the same way: plug in over USB, register the wallet once and check addresses on the device. The bigger E Ink touchscreen makes the registration and address checks easier to read. Bluetooth and NFC don’t come into it, because Sparrow only talks to hardware wallets over USB.

The setup guide uses a Ledger Nano S Plus. If you already own a Flex or a Stax, or prefer a touchscreen, you can use it as the Ledger key instead. I haven’t used a Flex or a Stax in this setup myself. What follows comes from Ledger’s product pages, the Ledger Bitcoin app’s source code and changelog, and Sparrow’s own device code, checked October 2026.

How registration works, why Sparrow keeps the proof of it in the wallet file and how to set up the passphrase is all in Ledger multisig with Sparrow. This page only covers what’s different on the bigger models.

At a glance

	Nano S Plus (the guide)	Flex	Stax
Screen	Small, two buttons	2.8-inch E Ink touchscreen, 480 x 600, Gorilla Glass	3.7-inch curved E Ink touchscreen, 400 x 670
Secure element	ST33K1M5, CC EAL6+	ST33K1M5, CC EAL6+	ST33K1M5, CC EAL6+
Connections	USB	USB-C, Bluetooth, NFC	USB-C, Bluetooth, NFC, wireless charging
Bitcoin app and registration	Same	Same	Same
How Sparrow connects	USB	USB	USB
Price at Ledger (Oct 2026)	$69	$249	$399

Prices change often and differ per country. Check the shop on the day you buy.

What stays the same

The Bitcoin app. You need version 2.1 or newer; the current one is 2.5.1 (September 9, 2026). Install it through Ledger Wallet, then close Ledger Wallet before you open Sparrow.
Registration. The Ledger keeps no list of wallets. When you approve a registration it gives Sparrow a code that Sparrow stores in the wallet file. A wallet rebuilt from the descriptor has to be registered again.
The derivation path m/48'/0'/0'/2' and the 24-word seed from step 4.
Ledger Recover stays off. It’s a paid service that splits an encrypted copy of your seed among outside companies.
Sparrow sees the device as a Ledger. Its hardware wallet library lists the Flex and the Stax next to the Nano S Plus, so nothing extra is needed.

What the touchscreen changes

The Bitcoin app has its own screens for the large Ledgers. In the app’s source code, registering a multisig on a Flex or Stax goes like this:

Review account to register. The app now says “account” where older guides say “wallet policy”.
Account name. The name you gave the wallet in Sparrow. Keep it short and recognizable.
Spending policy. Since Bitcoin app 2.5.0 (July 2026), a simple multisig is described in plain words instead of a raw descriptor template, so the 2-of-3 rule is easy to check.
Review co-signer public keys. One entry per key. Check each key’s master fingerprint against your notes.
Register account? Approve only when all three keys are yours.

The screens are much larger than on the Nano S Plus, so a long key or address needs less paging. That’s the main practical gain. Showing an address works the same way: Sparrow’s Display Address opens a Verify bitcoin address screen with the account name. Compare every character with Sparrow anyway, as in step 8. After registration the Ledger is one of the two devices you rely on for that check.

When you sign, the Ledger shows the account name with the transaction. Check the address and amount, then approve.

Bluetooth and NFC: not used here

Sparrow’s hardware wallet code only knows USB-type connections. It has no Bluetooth support, so the Flex and Stax are plugged in with a cable like the other two devices. The box comes with a USB-C to USB-C cable. If your signing laptop only has USB-A ports, you need an adapter.

Bluetooth is for Ledger Wallet on a phone. NFC is for Ledger’s security-key logins and for the Ledger Recovery Key, a card that comes in the box.

I’d leave the Recovery Key card unused

Ledger describes the Recovery Key as a PIN-protected card that stores your 24 words in its own secure chip. Three wrong PINs erase it.

In this setup every key has one backup: the metal plate from step 5. Each extra copy is one more thing to guard. If you use the card anyway, store it like a seed backup, never next to the device. It holds the 24 words only, not a passphrase.

Passphrase on the Flex and Stax

If you use a passphrase, Ledger offers the same two options as on the Nano S Plus: attach it to a second PIN, or enter a temporary passphrase that’s gone when the device turns off. You type it on the touchscreen keyboard, which Ledger says makes typos less likely than on the small Nanos.

For Sparrow, attach it to a second PIN and always unlock with that PIN. A temporary passphrase means typing it again every session, and one typo opens a different, empty wallet. Keep it within 50 plain ASCII characters so the same passphrase also works on the Trezor.

Is a Flex or Stax worth it here?

For a 2-of-3 run from a desk, the Nano S Plus does the same job for a fraction of the price. The bigger screen makes checks more comfortable, not more secure: the chip, the app and the registration are the same. If you already own a Flex or Stax, use it. If you’re buying new for this setup, I’d buy the Nano S Plus and spend the difference on metal backups.

Either way, it’s your one Ledger. Two Ledgers in the same 2-of-3 defeats the point of three brands.

Buying a Ledger

Buy only from Ledger’s own shop or from Amazon.com itself (“Ships from and sold by Amazon.com”), never from a reseller. After devices from one reseller were drained in October 2026, that’s the rule on this site; see the Ledger reseller attack. Do the tamper check when it arrives.

Buy from Ledger · Ledger Flex on Amazon · Ledger Stax on Amazon

Common mistakes

Expecting Sparrow to find the device over Bluetooth. Use the cable.
Leaving Ledger Wallet open, so Sparrow can’t reach the device.
Approving the registration without checking the three fingerprints.
Storing a Recovery Key card in the same place as the device.
Unlocking with the normal PIN when the wallet uses a passphrase.