(First of all, I'm totally new to this)
I've installed elementary OS alongside Windows 10 (shrinking the main partition of windows with a new empty partition of 100GB, and then installed Elementary using an USB flash drive).
elementary OS seems to work perfectly, but i can't access Windows Boot Manager anymore from the GRUB Menu, it says:
Keep it mind that i'm using a Lenovo laptop (FLex 14-D).
Can you help me please?