You need to solve Healing the Toothbrush 1 to do this challenge

Now that you know how events are encrypted in my toothbrush's subconscious mind, you are ready to have it talk. Fortunately, the psychiatrist helps you.

The toothbrush's subconscious mind consists, apparently, in a rolling table of 256 events, where each event is indexed by its index in the table. You cannot directly read an event entry, but you can ask information for that index. For that, you need to:

Enable notifications via handle 0x26
Write to handle 0x28 with data containing a dummy event with the index you want to read
Receive notifications on handle 0x25

The format of an event is:

raw data: 5 bytes (not used)
start date: 6 bytes (YY MM DD HH MM SS)
brushing duration: 4 bytes
index: 1 byte

Total: 16 bytes

Then, the bytes of the event are swapped reverse (first byte becomes last) and encrypted (see stage 1).

Finally, the following might help you:

Is my toothbrush really smart?
Sample Python code to get notifications (example.py). This code is for Linux only. If you don't have Linux, reading the source code might nevertheless help you out.

Important:

Please come and borrow the toothbrush when you need it.
If you don't have a Bluetooth Low Energy capable device, you may also borrow a BLE USB dongle.
Remember that you can only have one connection at a time on a BLE device.
You are not allowed to modify the toothbrush's hardware.
Sometimes, the toothbrush doesn't respond very well. We recommend you try 2 or 3 times :(
Sorry, we don't provide tooth paste.

Author: cryptax