A Disk read error occurred when updating BIOS OptiPlex 3020 - Dell Community
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Configuring Dell UEFI BIOS to Legacy mode to install Windows 7 - 404 Tech Support
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Dell OptiPlex 3020 Small Form Desktop Computer PC, 3.20 GHz Intel i5 Quad Core Gen 4, 16GB DDR3 RAM, 512GB Solid State Drive (SSD) SSD Hard Drive, Windows 10 Home 64bit - Walmart.com
Solved: 7010, BIOS corrupted, blinking amber color 2,3 times - Dell Community
A Disk read error occurred when updating BIOS OptiPlex 3020 - Dell Community