Jetson Tx2 stuck at boot

I edited the /boot/extlinux/extlinux.conf file to add at the arguments line the option

where is this file:

Now the jetson is stuck at boot with these lines:

[ 65.910429] usb usb2: Manufacturer: Linux 4.4.38-tegra xhci-hcd
[ 65.918866] usb usb2: SerialNumber: 3530000.xhci
[ 65.926163] hub 2-0:1.0: USB hub found
[ 65.932410] hub 2-0:1.0: 3 ports detected
[ 65.939217] tegra-xotg xotg: otg: host 3530000.xhci registered
[ 67.586223] xhci-tegra 3530000.xhci: tegra_xhci_mbox_work mailbox command 5
[ 67.595792] xhci-tegra 3530000.xhci: tegra_xhci_mbox_work ignore firmware MBt
[ 67.944921] xhci-tegra 3530000.xhci: entering ELPG
[ 67.956396] xhci-tegra 3530000.xhci: entering ELPG done

Can someone help?
Thank you very much.


How to resolve this?