[constantly]

“You might have noticed the color of the brush head changing throughout of this post. This is because I had to run out and buy a new one after getting locked out of the first one.”

The concept of getting locked out of one’s toothbrush head is so absurd it might as well be dystopian.

[beebeepka]

What's there to be locked out of? I've this brown diode blinking for half an year. Are they disabling the vibrator?

[oasisaimlessly]

> [We] can see that the tag is configured to permanently disable all write access after three wrong password attempts. (Which I promptly exceeded when playing around) This means that not even the toothbrush handle itself can write to this head again.

[lights0123]

It didn't mention that the toothbrush failed to keep vibrating, just that the toothbrush head lost its function as a writable NFC tag.

[tgsovlerkhgsel]

What happens in that case? Does the toothbrush misbehave/consider the brush beyond its lifespan, or is it a convenient way to disable this feature?

[pests]

Just disable the feature the way the manufacture instructs instead of this random hacking? Why pull out all the engineering tools when the step by step is in the manual?

[jrockway]

I think that's a symptom of buying off-the-shelf NFC hardware. They all lock you out after some small number of incorrect attempts to guess the password, because some security researcher noticed how easy it was to try every password and people stopped buying their stuff if they didn't have this feature.

This equipment is not necessary for a toothbrush "minutes used" counter, but unfortunately, there is no off-the-shelf alternative.