ASI driver blocked?
No issues here….
I've read about these issues.
I've paused win11 updates for the maximum of one week that it allows me just in case :(
Hi everyone
I believe this was caused by a recent W11 update. I raised the issue a couple of weeks ago with ZWO, who verified the problem, and said they are working with Microsoft to fix the issue. But no new driver yet. Please complain to ZWO, maybe they will work faster.
A temporary fix is to go to settings>System>Recovery and choose Restart now. In the restart select the option to disable driver signature enforcement. This will hold until you restart your computer, so is only temporary.
A more lasting solution is to run CMD as admin.
Type the following:
bcdedit /set testsigning on
or this should work as well:
bcdedit /set nointegritychecks on
This change will stay “permanently”. Change on to off to go back.
Note in my troubleshooting I also turned off UEFI secure boot off, so that may be necessary. You do this during a restart—do a quick search on-line you can find detailed instructions.
Finally, drivers are not checked so a little security risk in this mode, be very careful with drivers you load in this mode.
Rick
Rick Veregin · May 24, 2026, 01:53 PM
Hi everyone
I believe this was caused by a recent W11 update. I raised the issue a couple of weeks ago with ZWO, who verified the problem, and said they are working with Microsoft to fix the issue. But no new driver yet. Please complain to ZWO, maybe they will work faster.
A temporary fix is to go to settings>System>Recovery and choose Restart now. In the restart select the option to disable driver signature enforcement. This will hold until you restart your computer, so is only temporary.
A more lasting solution is to run CMD as admin.
Type the following:
bcdedit /set testsigning on
or this should work as well:
bcdedit /set nointegritychecks on
This change will stay “permanently”. Change on to off to go back.
Note in my troubleshooting I also turned off UEFI secure boot off, so that may be necessary. You do this during a restart—do a quick search on-line you can find detailed instructions.
Finally, drivers are not checked so a little security risk in this mode, be very careful with drivers you load in this mode.
Rick
Can confirm the restart method works.
I used Shift+ restart and then disabled them that way. Such an annoying issue!
Glad it worked for you Luke! It is annoying and it seems to me correcting the driver certification should not take this long, not sure why they are so slow to fix the issue…
Rick
Good to know, I will block Windows-updates on my Windows 11 PCs until this problem is solved.
Walter Leonhard Schramböck · May 25, 2026, 11:26 AM
Good to know, I will block Windows-updates an my Windows 11 PCs until this problem is solved.
Also a security issue to do that, though I also usually have updates delayed a bit to try to weed out bad updates…
Walter Leonhard Schramböck · May 25, 2026, 11:26 AM
Good to know, I will block Windows-updates on my Windows 11 PCs until this problem is solved.
Put it on your calendar and just keep doing it. I think the max is 5 weeks.
Luke Pearson · May 25, 2026, 03:48 PM
Everyone I have had an email back from ZWO. See attached:
That’s great news, Luke!
Rick
Hi everyone
Just to let you know the new ZWO driver is out with the corrected certificate, so it is no longer blocked. I can confirm the driver loaded fine with no special settings.
Note the ZWO site shows it still as v3.27 but if you download it you can see it is the new driver v3.28 from the May update.
Rick
Luke, good to hear that ASI is working on getting the driver signed, because none of the suggested fixes have worked on my HP laptop. I have tried the UEFI fix, the Restart fix, and the Admin CMD fix. Nothing works.
ETA: Annnd …. upon posting, saw Rick’s post above. Good news, indeed! Off to the ZWO site.
ETA2: It works! All is well again, and I am a happy astrophotographer.