how to fix 2026-08 Security Update (KB5121003) (26100.9168) update

Question

how to fix 2026-08 Security Update (KB5121003) (26100.9168) update

nitin sen 15

its showing failed and failed when i try to update my device and then go to update and it show retry failed update please help me i want to exit from window insider program and i am basic art student i do not know my much and i joined it by mistake now i unable to exit from it

0 comments

3 answers

Your answer

Answer 1

Thoura Sopheak Nanta 655

Hi @nitin sen

I understand you want to stop getting preview builds from Windows Insider.

Please try these steps:

Open Settings.
Go to Windows Update.
Select Windows Insider Program.
Choose Stop getting preview builds.
Follow the on-screen instructions to unenroll your device.

If your on Windows 10, it may be Settings > Update & Security > Windows Insider Program, then turn on Stop getting preview builds.

Also, may you press Win + R then type in 'winver' and screenshot it for me or tell me what build does it show? That way we can find a way to unenroll from Windows Insider.

If you want to go back to a stable version immediately, you may need to back up your important files first and use Windows recovery or reinstall Windows.

Best regards,

Nanta

john payne 0 Reputation points

2026-08-18T20:17:57.5533333+00:00

That does not work
Cheryl Waye 0 Reputation points

2026-08-19T01:18:12.9233333+00:00

I got a message "we can't reach window insider programme right now. Try again later 🤷🏼‍♀️
Thoura Sopheak Nanta 655 Reputation points

2026-08-19T04:14:45.8133333+00:00

Hi @Cheryl Waye @john payne

Did you press Win + R, type in winver, and screenshot it and send it to me.

Hope to hear back from you.

Best regards,

Nanta
Cheryl Waye 0 Reputation points

2026-08-19T06:53:45.1433333+00:00

@Thoura Sopheak Nanta
CrazyKats 19,245 Reputation points Volunteer Moderator

2026-08-19T22:41:51.9533333+00:00

Thoura, this is not a Windows 10 forum. This is for Insiders

on Windows 11.
Cheryl Waye 0 Reputation points

2026-08-20T04:04:53.0166667+00:00

What is this Insiders on Windows 11 that you speak of?
Thoura Sopheak Nanta 655 Reputation points

2026-08-20T04:05:19.7566667+00:00

Oh, sorry @CrazyKats I'm still using Windows 10, apologies for the mistake

Answer 2

CrazyKats 19,245 Volunteer Moderator

Hi,

@Cheryl Waye @john payne

I would suggest you both use this

link to update:

https://www.microsoft.com/en-us/software-download/windows11

It's a newer build than you are both on.

Download the ISO, mount the ISO, then open

the ISO folder and run Setup.

Also you should both delete this Registry Key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsSelfHost

This will also take you out of Insiders.

Cheryl Waye 0 Reputation points

2026-08-20T03:49:50.7966667+00:00

Hi CrazyKats

Apparently I am up to date. I don't know what the iSO is, but
Cheryl Waye 0 Reputation points

2026-08-20T04:09:29.2966667+00:00

When I go to the insider programme under settings it's asking me to join so now I am totally confused. Shoud I join?
Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
CrazyKats 19,245 Reputation points Volunteer Moderator

2026-08-20T12:47:05.12+00:00

Hi Cheryl,

If it's asking you to Join then you

aren't an Insider and are posting

in the wrong section (tag) of the forum.

If you are up to date, then all is good.
john payne 0 Reputation points

2026-08-20T17:38:28.3133333+00:00

Yeah, this isn't working for me either. Thanks for trying to help.
Cheryl Waye 0 Reputation points

2026-08-21T11:38:53.17+00:00

Thx @CrazyKats

I'm sorry if I'm in the wrong place, but I searched for an answer to 'how to fix 2026-08 Security Update (KB5121003) (26100.9168) update' and microsoft brought me here. I don't know how else to find help

Answer 3

Deleted

This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.

4 deleted comments

Comments have been turned off. Learn more