Hi have a LC Technology Relay x4 board with a custom-firmware (using ESPHome) on the ESP01 attached to it.
As a curiosity, I pressed on the S1 switch to see if it's doing something. The "normal" red led indicating MODE 1 turned off and the "MODE 2" blue led turned on. I found the meaning of those LEDs from documentation like this one.
My question is very very simple: How could I make my board returning to "Mode 1"? It seems the Mode 2 is doing something totally different and the board is not responding anymore to UART commands activating the relay.
I have the quad 12V model, but it's the same for all variant of this bord (dual or 5V versions).