Dell S4048 stuck in rescue grub mode

Hello,

If your S4048 is stuck at the grub rescue> prompt, here's something that might help:

When the switch boots, you should normally see the GRUB menu with a list of boot options. If you're only seeing the grub rescue> prompt, try rebooting the switch and pressing the Esc key during the early boot process  that should bring up the full GRUB menu.

From there, the easiest way to recover is to boot into ONIE: Rescue mode. Just a heads up though: this will wipe the installed OS and any configuration on the switch, so make sure you're okay with that.

Here’s what to do:

1. In the GRUB menu, select ONIE: Rescue.
2. The switch will boot into the ONIE environment — it might take a little while.
3. Once you're in the ONIE CLI, it should automatically start restoring the factory defaults.
4. After it's done, the switch will reboot.
5. At that point, you’ll need to reinstall your network OS (like OS10, Cumulus, etc.).

Hope that helps! 

Hello Erman

think you for your support, when i presse esc i get the Following screen

Hey let's check manually boot. 

Type:

fs0:

press enter

then try 

Insert the USB into the switch.

Reboot the switch and press Esc to enter the boot menu.

In the EFI shell, type: