ASUS X550CA: keeps booting to EZ Flash Update mode


Sep 16, 2017
Recently my ASUS X550CA-SI30304R notebook is having a serious problem. It keeps booting to EZ Flash Update screen even after replugging the HDD in. The issue happened after a Windows 10 update, also I should mention that the keyboard has some faulty keys. Tried the Function keys without any positive result.

In the aforementioned screen, says "Check System Error" and also something about plugging in the battery first (my battery is completely dead though). What is curious is that once it booted to Windows normally, but a few days later the problem came back.

Haven't tried the CMOS clear but I fear it might be a motherboard fault. Any solution?