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This boot drive can only run on UEFI mode. It can not boot in bios/legacy mode - Troubleshooting - Linus Tech Tips
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NEED A HERO! Just bought a custom-build and now it's stuck in firmware... ( UEFI thinks it's BIOS?) : r/ASRock
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Acronis True Image: how to distinguish between UEFI and Legacy BIOS boot modes of Acronis Bootable Media | Knowledge Base
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