• Win10 1803 boot failure loop: bootres.dll is corrupt

    Posted on August 16, 2018 at 10:43 CDT by • Comment in the Forums

    This appears to be a general 1803 bug, not associated with any specific cumulative update.

    From @Dougcuk:

    There is recurring issue reported online where Win10 gets stuck in a repair loop. The Win10 Recovery Environment (RE) option Startup Repair fails to correct the problem. The Startup Repair log c:\windows\system32\logfiles\srt\SrtTrail.txt reports a fault:

    Root cause found:
    —————————
    Boot critical file c:\efi\microsoft\boot\resources\custom\bootres.dll is corrupt.

    Repair action: File repair
    Result: Failed. Error code = 0x57

    The odd part of this error is the “Custom” folder location – this is not part of the normal folder structure. The bootres.dll file normally resides in the “Resources” folder with the BCD file in the folder above (Boot).

    What the error is reporting is that the bootres.dll file is missing (rather than corrupted) On the systems I have checked the “Custom” folder does NOT even exist – thus the bootres.dll cannot be present at this location and is declared “corrupt” by the Startup Repair utility.

    The bigger mystery is why the System thinks the file should be located in a “Custom” sub-folder in the first place. (Also I think the c: drive letter shown is an artifact – most likely it refers to the first partition – not the actual main C: drive – but that is a whole different can of worms)

    I am currently working on two HP laptops with this exact problem – both went down within an hour of each other. At first I though it must be a virus or malware attack gone wrong – but could find no evidence to support this idea.

    Having read multiple postings and responses across many different online forums: The evidence suggests this is a Microsoft bug that affects a limited number of Win10 systems. The problem appears to affect systems recently upgraded to version 1803 (only one case listed 1709 on a Surface device) – but only occurs after further updates (as yet unidentified) and then a full restart.

    I am exploring BCD repair and rebuild options with some success – but have no clean fix as yet (the standard RE repair options get lost)

    Anyone have any experience of this problem or ideas as to what causes this error?

    Other ,
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