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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(288, 44%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESA%3C/text%3E%3C/svg%3E)
Hello, today I ran into the problem that I can’t download symbols for any version of bootmgfw.efi, although they loaded normally earlier, did Microsoft remove the symbols for this file on purpose or is this some sort of a bug?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(252.8, 77%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3E9%3C/text%3E%3C/svg%3E)
I have the same issue and I strongly suspect that Microsoft did this as a response to the Black Lotus vulnerability, because, as described here (See "1. An installer deploys files to the ES"), some versions of the Black Lotus malware downloaded EFI bootloaders, such as https://msdl.microsoft.com/download/symbols/bootmgfw.efi/7144BCD31c0000/bootmgfw.efi, directly from the symbol servers, as part of their payload installation.
It looks like Microsoft overreacted to this and decided that they would remove access to everything EFI from the symbol servers as a result, which completely sucks, because you can't even download the newer non vulnerable bootmgfw.efi (such as https://msdl.microsoft.com/download/symbols/bootmgfw.efi/B647817D2ba000/bootmgfw.efi) to manually sort out systems that may be vulnerable to Black Lotus...
Note that I am talking about the actual binary and not the symbol files here, as the .pdb does work, but the corresponding .efi binary, which should also be provided, doesn't.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(67.2, 68%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELT%3C/text%3E%3C/svg%3E)
Hello there,
Can you share the exact error message you are getting?
Symbol files make it easier to debug your code. The easiest way to get Windows symbols is to use the Microsoft public symbol server. The symbol server makes symbols available to your debugging tools as needed. After a symbol file is downloaded from the symbol server, it's cached on the local computer for quick access.
Microsoft public symbol server https://learn.microsoft.com/en-us/windows-hardware/drivers/debugger/microsoft-public-symbols
Hope this resolves your Query !!
--If the reply is helpful, please Upvote and Accept it as an answer–
For instance, this link http://msdl.microsoft.com/download/symbols/bootmgfw.pdb/CA520E25F9D39377C200778468F5A9B52/bootmgfw.pdb used to work fine but now it doesn't work.
UPD: The link now works again