Helios 300 PH315-51 cannot boot after BIOS update

Marcki07

Please can you help: I experienced the black screen issues in my Helios 300, constant freezing, etc. I installed the latest BIOS from the Acer website, and for a few hours it was working. But when I tried to uninstall an antivirus software, problems began to appear. First my sound and internet connection were gone. When I tried to reboot, "bootable device missing" appeared on my screen and I can no longer boot properly. 

I tried to install windows using usb drive, but it cannot locate the hard drive. When using the command prompt, it says x:\source. Selecting the advanced options for repair (startup repair, system restore, uninstall updates...) were also unsuccessful. 

smgeek1210

I have a similar problem with my Helios 300 PH315-51, after bios update to 1.22 i can't boot from PCI NVMe because is not recognized anymore. I tried to run live FreeDOS to run next BIOS updates but also is not possible to run in legacy mode there's not option for legacy only appears UEFI. So im stuck. Please help.