Ledger Donjon hasn't managed to break the MK4 yet, and I guess they have all the nice equipment. Seems like the most secure hww that is currently available imo.

https://www.ledger.com/blog/category/donjon

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yes, they have, the SE2 used by CC Mk4 is broken (source: Coinkite), and SE1 also has been broken (source: a talk by the Ledger Donjon team)

Missed that, sounds interesting, need to watch the talk👀