My Dell Laptop won't reboot after Windows 10 update

[Windows Central Question]

I've ried using the Microsoft Media tool, but it won't recognize any of the flash drives I've tried using my work laptop. I created an ISO flash drive, but I got a black screen message that BOOTMGR (???) was missing. When I turn on the power it opens to a blue RECOVERY screen.

What else can I try?

 

[Maurizio Troso]

I've ried using the Microsoft Media tool, but it won't recognize any of the flash drives I've tried using my work laptop. I created an ISO flash drive, but I got a black screen message that BOOTMGR (???) was missing. When I turn on the power it opens to a blue RECOVERY screen.

What else can I try?

Remove the usb key, turn on you notebook pressing repatrly ctrl till a boot menu appears. With arrows select Hard Disk and press Enter.

Media Creation tool works inside Windows and it doesn't need any usb key too, it can upggrade directly as is Window Update choosing update now

If doesn0t work, complete the recovery sequence for gettin back control on laptop.

USB Media key is useful for upgrading more devices one after other