Windows 10: Feature Update 1903 installed now can't use Advanced Startup to access Command Prompt

Just installed 1903 update. Now if I follow Advanced Startup - Troubleshoot - Advanced Options - Command Prompt I get a message saying that I need to sign in as an administrator. It goes on to say that I do not have any administrator accounts on this PC. In fact I have 2 administrator accounts on my computer. I went back into windows and logged into the other administrator account and tried it from there but got same results. Created a new admin account, logged into it and tried it from there but still got the same results.


Has anyone seen this issue?

:)

 

No Command Prompt in Advanced Startup

I'm trying to use MBR2GPT in Windows 10 for my system disk so I can use UEFI, and I suppose I need to use command prompt in Advanced Startup.

But when I do Advanced Startup and go into Troubleshoot, the only option I can see is Startup Settings.

No Command Prompt, no System Restore, nothing, just Startup Settings.

So how can I get access to command prompt? Or can I just use MBR2GPT in cmd while running Windows 10?

 

command prompt will not open in safe mode with command prompt

Would I just follow the same steps within safe mode after hooking up to the other system?

 

Installation media boots to command prompt

I've just booted from known working install media to see exactly what it does when booting. The sequence of events is...

1. Windows logo on a black screen
2. circling dots appear beneath the logo
3. light blue 'Please wait' screen with circling dots
4. a command prompt window (very briefly)
5. the initial Setup page appears

Do you see steps 1-3? If so, it appears you have stopped at step 4, suggesting that something on the disc cannot be read.

Does the disc boot properly in another machine? If so, try cleaning the laptop's drive lens then try booting from the disc again.

If not, make new install media with Microsoft's Media Creation Tool, either as a bootable USB, on an ISO that you can burn to another disc. At Step 8 in Option One of this tutorial you can choose between making a USB or an ISO.

Download Windows 10 ISO File