USB console isn't working. Go back to UART8 which is.

nuttx/configs/px4fmuv2/nsh/defconfig

@@ -234,10 +234,10 @@ STM32_FLASH_PREFETCH=y
 # CONFIG_USARTn_2STOP - Two stop bits
 #
 CONFIG_SERIAL_TERMIOS=y
-CONFIG_SERIAL_CONSOLE_REINIT=y
+CONFIG_SERIAL_CONSOLE_REINIT=n
 CONFIG_STANDARD_SERIAL=y
 
-CONFIG_UART8_SERIAL_CONSOLE=n
+CONFIG_UART8_SERIAL_CONSOLE=y
 
 #Mavlink messages can be bigger than 128
 CONFIG_USART1_TXBUFSIZE=512
@@ -555,8 +555,8 @@ CONFIG_START_MONTH=1
 CONFIG_START_DAY=1
 CONFIG_GREGORIAN_TIME=n
 CONFIG_JULIAN_TIME=n
-CONFIG_DEV_CONSOLE=n
-CONFIG_DEV_LOWCONSOLE=n
+CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=y
 CONFIG_MUTEX_TYPES=n
 CONFIG_PRIORITY_INHERITANCE=y
 CONFIG_SEM_PREALLOCHOLDERS=0
@@ -943,7 +943,7 @@ CONFIG_USBDEV_TRACE_NRECORDS=512
 #   Size of the serial receive/transmit buffers. Default 256.
 #
 CONFIG_CDCACM=y
-CONFIG_CDCACM_CONSOLE=y
+CONFIG_CDCACM_CONSOLE=n
 #CONFIG_CDCACM_EP0MAXPACKET
 CONFIG_CDCACM_EPINTIN=1
 #CONFIG_CDCACM_EPINTIN_FSSIZE
@@ -1014,7 +1014,7 @@ CONFIG_NSH_ROMFSETC=y
 CONFIG_NSH_ARCHROMFS=y
 CONFIG_NSH_CONSOLE=y
 CONFIG_NSH_USBCONSOLE=n
-CONFIG_NSH_USBCONDEV="/dev/ttyACM0"
+#CONFIG_NSH_USBCONDEV="/dev/ttyACM0"
 CONFIG_NSH_TELNET=n
 CONFIG_NSH_ARCHINIT=y
 CONFIG_NSH_IOBUFFER_SIZE=512