Guys I used none Beta Bios without issue. U should not need bios update.
Sadly I was a sheep and followed those who wanted the extra SSD speed by using the Asus M2 board , and that requires the BIOS update.
Your instructions and the OC stage 1 & 2 were fine before the update , so the beta BIOS has caused me some issues especially around cold starts both with and without wall socket disconnection.
Sorry if I derailed the thread , hopefully I have found my solution fingers crossed