TRASHe

Quite recently there was a pretty cool demo running here. So, after a little cracking, the hidden part was finally found. There was no survey sign or sign on the button, but you can turn it on by directly changing the byte inside:
in general, in the third sector, the first byte #21 is changed from the beginning to #с3
To return to the normal form, you need to do the reverse operation.
Well, that’s it!

goodluck...

Aleksander