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No, Event ID 1796 by itself doesn't generate the PIN unavailable message.
But if the Secure Boot DB/DBX update was accompanied by a firmware/TPM modification, then that might disable PIN sign-in.
Secure Boot DB and DBX variable update events
![](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(268.8, 79%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHP%3C/text%3E%3C/svg%3E)
Howard Peng (彭黃石)
45
Reputation points
If this event (Event ID: 1796) is triggered after "Set a PIN password", will it result in the following message?
"Something happened and your PIN isn't available"
Windows for home | Windows 11 | Security and privacy
Answer accepted by question author
![](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(48, 27%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EI%3C/text%3E%3C/svg%3E)
IGYQ
19,610
Reputation points
Independent Advisor
-
Howard Peng (彭黃石) 45 Reputation points
2025-09-25T06:47:32.8766667+00:00 The Secure Boot update failed to update a Secure Boot variable with error Unknown HResult Error code: 0x800700c1. For more information, please see https://go.microsoft.com/fwlink/?linkid=2169931
Does update a Secure Boot variable mean a firmware/TPM modification failed? right ?
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