Looking at the base of the head shows that it contains an antenna and a tiny black box that is presumably an IC. The next hint can be found in the manual where it says that: “Radio Equipment in this product operates at 13.56 MHz”, which would indicate that it is an NFC tag. And indeed when holding the brush head to my phone it opens a link to a product page: https://www.usa.philips.com/c-m-pe/toothbrush-heads.
Cyrill dives deep to decode the NRF tag, find it’s password to unlock writing to the data & more. Read the rest here.
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- Source: https://blog.adafruit.com/2023/05/31/hacking-a-smart-toothbrush-hacking-reverseengineering/
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