PSA: Coldcard Mk4 BRICKED by the new emergency firmware hotfix (seed.py crash). Irony at its finest.

Just wanted to put out a serious warning for anyone updating their Coldcard Mk4 to fix the recent RNG/seed generation vulnerability.

I followed Coinkite's urgent advisory to the letter: updated to the new hotfix firmware 5.6.0, wiped my old seed, and generated a brand-new one. I even tested it, created two BIP-39 passphrases, and everything seemed fine at first.

But then, the premium "Don't Trust, Verify" experience kicked in.

While I was testing the passphrases—literally just entering the words and clicking apply—the device threw a critical MicroPython software crash error pointing directly to `seed.py` and another method. To be precise, I had done this exact same process successfully several times just before it happened, so it doesn't look completely deterministic, but the bug is definitely present and lurking in the code.

I had to power cycle it, and guess what? The screen now permanently reads "BRICKED". No recovery mode, no factory reset, just a hundreds-of-dollars paperweight. I bought a bundle of 2 units directly from their site, and one is already dead due to their rushed code.

If you are running the new firmware and messing with passphrases, PLEASE BE CAREFUL. This hotfix seems to have a catastrophic bug that permanently hard-locks the secure element or the firmware during passphrase application.

Hey Coinkite, I thought Coldcard was the ultimate, unbreakable fortress for paranoid Bitcoiners? Fixing a critical seed generation vulnerability with a firmware bug that literally kills the hardware is quite a strategic move to sell more devices!

This is completely unacceptable for a premium security device, also given what is happening. Anyone else experiencing crashes or weird behavior on the new firmware?

Lmk.