Fixes:
1. Enable deep sleep mode in S4
2. Keep the value of Secure boot control/Boot mode/Load Legacy OPROM after loading default by F9/SetupD4/RTC load default.
3. Update BIOS Dell diagnostics to version 4220.10
4. Make screen full fit the display when boot to OS DVD and Security boot enabled.
5. Unify LAN boot message position under UEFI boot mode.
6. Simplify "Clear Secure Boot Key" item in setup menu.
7. Update Intel Management Engine Firmware to version 8.1.2.1318 (Hot Fix 2)
8. Update BIOS liberary for secure boot manual test after 9/16/2012.

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Note: Try to set a system restore point before installing a device driver. It will help you restore system if installed driver not complete.