Hi,
I’m trying to connect to the boards jtag and when power cutting and turning on board to reset boot sequence max 10-20 times and boards (i have 10) die like flies with blue led is not lighting up and completely unresponsive other than red led in right corner?
That is strange. Could you share your wiring, voltages and power sequences?
Does it say anything over UART?
Does the SD card still work in other boards? Sometimes the SD filesystem can be corrupted if power is cycled during write operations so it’s important to check if it still works in a known-good board.