I am having the same problem on my GU502GV. I cant change the voltages using Throttlestop or XTU.
How can i downgrade my BIOS to an older version, like 307,
Please refer to below notice from Intel
We will follow this by BIOS update for all model affected.
Really sorry for any inconvenience caused.
Thank you for your continued support and patronage.
The link is broken. My model is a G531GU and I recently bought two 3200mhz ram memories but it only works on 2666mhz there is no option to activate the xmp profile. Could you send me this bios. On the site there is only 309 onwards.