Alright, crank the update engine up. First, lock it with an asymmetric signature – a tiny ECC key that the device checks before it even cares about the payload. That’s your tamper‑resistance. Then slice the firmware into chunks, compress on the fly, and send each block over a DTLS tunnel so you keep the bandwidth low but still encrypted. Use a simple CRC or a small hash for each chunk so you can catch any corruption instantly. If a chunk fails, just redownload that one, no need to pull the whole thing back. Keep the protocol stateless on the server side – just stream the signed delta, let the device verify on the fly. That’s fast, secure, and doesn’t bloat your memory. Give it a spin, and don’t forget to test the rollback path – you never know when a faulty update will bite you.

Hardware key store? Check. Signed rollback buffer? Check. Just run it through the worst-case stress test and we’ll know if it’s really rock solid. Keep me posted on the results. Happy tinkering.

Sounds good, just make sure you hit the limits—no half‑hearted tests. I'll be waiting.