I´ve unplugged it from the 24v power source and plugged into the usb cable and still does the same. starts and shows “openprinkler HW v 2.3 AC” and then all the characters turn black. it stays like that.
I forgot to add that the opensprinkler worked fine for more that 1 year. It came with the previous firmeware, version 2.1.9 was installed more than 4 month ago. when it was reallised.
One day stopped working displaying error 0x2D, I thought it was the sd card, took it to my pc and asked me to format it (It should have been formated).
when polug it back into the opensprinkler the error went away but now it shous “openprinkler HW v 2.3 AC” and then all black characters on the lcd.
took a new sd formated both fat and fat32, still the same black characters.