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I have Lenovo G510. I am upgrading from default i3 core to i7 4700MQ core. After that, I updated the BIOS to version 79CN50WW (V3.09). The laptop stopped booting. It also does not boot from a WIN PE flash drive, I tried different flash drives, different WIN PE, in MBR and EFI boot modes. All to no avail. On the stock BIOS, the laptop booted and worked fine. I did not make a backup before the update. How can I fix it?