I suspect that the BIOS is the issue but I have not been brave enough to reflash it, especially because you have to reboot it from BIOS to apply the update. My 5600U has P11-A0 BIOS (13/8/12) with V2 EC firmware (8/8/12). I also have a 7600U which has P11-A4 firmware (27/12/12) and V1 EC firmware (20/9/12). I have downloaded P01.A0_A_A.zip & P11.A4_A_A.zip as well as Firmware_Acer_1.0.0.6_A_A.zip but I have no idea which will safely work with the 5600U using Win10 so haven't risked any. However these are later files than the one on my PCs. I believe P11-A0 is EFI while P11-A4 is UEFI. Both my PCs have Win10 so maybe UEFI would be better. If anyone has succesfully updated the BIOS on a 5600U to a newer version it would be great to hear.
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