How does a console work?

[iyenal]

meanwhile, how does this microelectrics are written? there is no a b c d e, in microelectrics.
and it only understand binaries....
how does the computer memories those BIOS entry and registers?
technically, these BIOS are made of "images" of letters.

But how does it, remember and "boot" start the same way everytime?

Computers use small batteries to "power up" a RAM containing BIOS config (and hour), but that's because the user can change them. In a console, as I said before since no custom configuration is needed depending of the user, it is stored in a flash memory written during console manufacturing. Everything is literally written (in binary for sure in that flash of circuitry) so boot the same time everytime.

BIOS is composed of instructions (assembly) ran by the chipset (now in the CPU) which charge to initialize the CPU since the CPU itself can run them as it is not initialized yet (its RESET pin is high so it can't execute anything).

There is dozens of book which speak of that, I would advise to start with this one: https://bunniefoo.com/nostarch/HackingTheXbox_Free.pdf (it recently became free).