Forum Discussion

AlyMds's avatar
AlyMds
Copper Contributor
Jan 29, 2026
Solved

Stopcode 0x7B inaccessible boot device

I tried to boot my Dell Optiplex 3080 MT installed with Windows 11 pro from USB stick bootable to ESET SysRescue, it seem the PC did not liked it and display stopcode 0xB7 and its windows tsrt up rep...
announcement
  • Carlos_Chaves's avatar
    Carlos_Chaves
    Jan 30, 2026

    Hi AlyMds​ 

    Thanks for reaching out and for sharing the detailed context.

    Just a quick note up front: this space is dedicated to Microsoft Learn for Educators (MSLE) topics (program access, onboarding, curriculum alignment, certifications, etc.). Deep technical troubleshooting—such as low‑level boot, BIOS, or disk‑partition recovery—is a bit out of scope here.

    That said, your points about MBR vs GPT and UEFI vs Legacy/CSM are valid—Windows 11 on Dell OptiPlex systems typically expects UEFI with GPT and Secure Boot enabled. Reviewing BIOS boot mode, Secure Boot, and boot order would be a good next step. For hands‑on recovery guidance, Dell Support, Microsoft Q&A, or ESET support would be the best channels.

Carlos_Chaves's avatar
Carlos_Chaves
Icon for Microsoft rankMicrosoft
Jan 30, 2026

Hi AlyMds​ 

Thanks for reaching out and for sharing the detailed context.

Just a quick note up front: this space is dedicated to Microsoft Learn for Educators (MSLE) topics (program access, onboarding, curriculum alignment, certifications, etc.). Deep technical troubleshooting—such as low‑level boot, BIOS, or disk‑partition recovery—is a bit out of scope here.

That said, your points about MBR vs GPT and UEFI vs Legacy/CSM are valid—Windows 11 on Dell OptiPlex systems typically expects UEFI with GPT and Secure Boot enabled. Reviewing BIOS boot mode, Secure Boot, and boot order would be a good next step. For hands‑on recovery guidance, Dell Support, Microsoft Q&A, or ESET support would be the best channels.

Resources