Dell 14-3452 with eMMC 32gb for C:drive. No Drive Installed

I have a Dell 14-3452 given to me for my 10 year old grandson to use with Win10. It has the embedded eMMC installed with 32gb for C: drive. I was able to update Win10 to 1511. Not enough storage to upgrade to Win10 1607.

 I downloaded Win10 from Microsoft using the MCT to a USB stick with the intention of doing a clean install to the eMMC and then using a 64gb SD card for the Apps.

I screwed up and deleted the C: drive partitions, I should have extended them instead.  Win10 install said unable to install on drive.

Found a tip on Dell forum to use Shift +F10 at the WIN10 install screen to get to diskpart. Then, list disk>select disk 1>clean> create primary partition>active> format fs=fat32 quick>convert gpt

Since then Dell 41-3452 says no drive installed.  I’ve reloaded the default using F9 at the setup screen. I can’t remove this embedded C: drive to re-initialize. With the Win10 USB stick installed I select USB at F12 boot up, the PC goes straight to Dell ePSA pre boot assessment diagnostics.

I think I may have killed this PC.  Any suggestions greatly appreciated.