HighPoint RR640L - Page 6

Linux Debian on RR640L/620L Installation Guide
b. Disable "Secure Boot", set "Attempt Secure Boot" to "Disabled".
2. Set UEFI setting with ASUS PRIME X299 -DELUXE motherboard as an example:
a. Set "Boot from Storage Devices" to "UEFI driver first";
b. And "Boot Device Control" to "UEFI Only" or "UEFI and Legacy OPROM";
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