Probook 640 G3 cannot PXE Boot

[Mongrat]

WE have about 12 of these machines and Im trying to get them set up. When I F12  i get "Entering Network Boot" then I can select IPv4.  It then goes to PXE over IPv4 and after about 2 seconds an ip and other text flashes up on the screen and it dumps back to the startup menu where you can select bios setup etc. It goes too fast for me to read it.

I have tried:

1. Updating the BIOS

2. Selecting Disable Legacy and Secure Boot

3. Disable Legacy enable Secure Boot

4. Enable Legacy and Secure Boot

One thing I have noticed, It seems to fail to save my selections. I have even tried F10 to save. I have also tried setting a BIOS password but when I click the link it does nothing.

Any help would be Great.

Thanks!

[Mongrat]

Figured it out. You must set a BIOS password for any changes to take. If you click on the link to set the password it doesent work, you must hi-light and press enter key. Once the password is set it will let you "Enable Legacy Support and Disable Secure Boot"