You can also look for Trezor, I think it's open source if I am not wrong.
Trezor is open source. The hardware wallet company continue to be open source when they begin to create wallets that have secure element, unlike Ledger Nano wallets that their secure elemens are close source. If he has Jade, I will still prefer it because it is airgapped which is one of the reasons I am recommending Foundation Passport.
Hi charles, I have a jade which I set up with nunchuck wallet airgapped but I have heard people saying not to use nunchuck because it also has a back up inheritance plan option which could be compromised.
I have tested how Nunchuck wallet is before. I have posted before in one of your trades that the inheritance is not for single signature wallet but for multisig.
I have also posted that you can connect other wallet with Jade. Not necessary to use Nunchuck. This is the third time I posted this image on another of your post. This is the image:
https://help.blockstream.com/hc/en-us/articles/9601453403801-Download-a-companion-app-for-JadeYou can connect any of the listed wallets in the image above with Jade.
One of the advantages of airgapped wallet is that you are completely sure that your seed phrase and private keys are not connected online. You have the option to use QR code for making transaction.