I converted my Jetson image to JP4.2.1 today. It boots and runs fine with the original TX2 module from the development kit. When I replace the original module with a fresh 4GB module from Arrow I can flash it successfully using the proper conf file, but when it boots it shuts down the carrier board (all LEDs turn off except for red charger LED). Using boot console on ttyS0 I can see that uboot completes but then the messages stop as soon as boot console is enabled by the kernel and then the carrier board turns off. As far as I can tell from the docs there is no hardware difference that should be causing this. Can anyone help?