[ferrum]

The restore function is extremely rarely needed, since in most cases it is associated with the repair and replacement of microcircuits. I don't install the board and only use it when I need it.

If you need a restore button, I drew a diagram that is understandable even to a non-repair specialist and it is quite easy to reproduce it.

The contact going to the LM77 is a connection with 3.2v, it can be taken from another place.
Difficulties may arise when soldering to the 42nd leg of the mega16 and this must be done very carefully without damaging the microcircuit, since in the event of a breakdown, the mega16 can only be taken from the donor