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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 repair did not help to fix it, I can manage to boot the PC from other device the SSD which is installed with windows 11 but not from the Windows 11 installed in the NVMe M2 neither from HDD which also has win 11 installed.

The partitions on the SSD read MBR and the partitions on the NNVME M2 and HDD read GPT, is it possible that the USB stick has changed the setting to read the DSSD partition MBR

What shall I do?

I feel that BIOS changes may be required.

Any help will be very much appreciated.

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  • 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.

1 Reply

  • 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.

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