How to reprogram the board?

Question

Programming

Good afternoon. There are digital clocks, for example, these (in fact, you can do any, the fact itself is finished) www.aliexpress.com/item/Free-shipping-wholesale-Ne...
The task is when you click on the left button, start the countdown timer on 2 hours.
From what side to approach this issue? There is only experience in the web.

Answer 1

It is necessary to pick a specific instance. With a high degree of probability, this watch will have a frameless microcircuit filled with a compound on the board.
It will be lucky if there is a controller and there are programming port pins (the Chinese now have a tendency to do it on the MK so as not to develop a specialized microcircuit), but even in this case success is not guaranteed.