Hi, I am the creator of a website where I compare more than 30 different hardware wallets, feature by feature: https://wallets.thebitcoinhole.com/

I am adding Satochips to the site but I have some doubts about its features. Maybe here someone can help me to clarify them.

1- Does Satochip has any supply chain/physical attack protection?
2- The firmware inside the Satochip can be upgraded? How?
3- Does Satochip has passphrase support? How?
4- Given that Satochip can be connected with thirdparty apps like electrum, this means that it supports features like multisig, coin control, custom node and testnet?
5- Is any kind of user added entropy when generating the private key?

Thanks