flag25.md

Flag 25 Hint

Every other characteristic on this device uses a short 16 bit UUID. Exactly one uses a full 128 bit UUID, and it is deliberately sitting at a handle you have no reason to guess.

Enumerate the characteristics and look for the odd one out. This is the flag you cannot solve by copying a handle number out of someone else's writeup.

Reading it is not enough - it will only tell you it wants a write. Write anything to it, then read it again.