I build five PiRTOs.
In building process, I removed SD-Reader connector and soldered it to PCB, after that I soldered Pi and when it was soldered I resolder SD-Cardreader back to it's connector.
I have these https://www.aliexpress.com/item/1939404111.html?
None of them work, it just flashes once when powered, then four times.
4 blinks: Card not initialized
I Noticed that four blinks happen also when SD-cardreader is not connected at all. Did I broke all of them when I removed connector? I have also tested three different cards Transcend 2gb and 4gb cards and newer 32gb Samsung, with same result. Card is formatted to FAT32.