Is there any risk when generating key pairs from a mycelium entropy device if it was previously owned?
It is possible to update the firmware and write your own if you wish, so it shouldn't be too hard to make it safe again if you know what you're doing.
Have a read through the user manual:
https://mycelium.com/assets/entropy/me.htmlGood luck finding a 2nd hand one to buy, very rare to find them for sale now.
This line from their webpage worries me more than dodgy key pairs:
"This device is not intended for use in safety-critical environments, or where
its failure could lead to death, personal injury, or collapse of the Universe