Yeah, a firmware on “a” raspberryPi can be validated, as nostr:npub1az9xj85cmxv8e9j9y80lvqp97crsqdu2fpu3srwthd99qfu9qsgstam8y8 said. Good luck
I'm comfortable with validating the nostr:nprofile1qqs09jtvjlmyrxjn37zv70a89csegcz7rpyqjmnw29cveedhv7vagqqpz4mhxue69uhk2er9dchxummnw3ezumrpdejqz9rhwden5te0wfjkccte9ejxzmt4wvhxjmcpzpmhxue69uhkummnw3ezuamfdejs92xe5k firmware before use, then loading that into the device memory. I also like to keep the validated OS version on a read-only CD backup.