Brave Browser (update failed to start; error code 3: 0X800700C1)
Author: unoukujouCreated Aug 19, 2026Updated Sep 15, 2026
LabelsConfirmation PendingBrowser: Brave
Describe what you noticed and did
- Fresh windows install
- Fresh Sandboxie installation with DefaultBox set to drop admin
- Install Brave into DefaultBox, Brave will ask if you want to install without admin, choose yes and install
- Open Brave, it works fine. But go to About Brave (at bottom of Settings page) and update fails to start.
I also noticed that the Brave icon inside Sandboxie processes list has a yellow icon with a black arrow pointing down as you can see in the screenshot. I'm not sure if that has anything to do with this.
How often did you encounter it so far?
No response
Expected behavior
Update to work
Affected program
Brave latest
Download link
https://laptop-updates.brave.com/latest/winx64
Where is the program located?
The program is installed only inside a sandbox (NOT in the real system anyway).
Did the program or any related process close unexpectedly?
No, not at all.
Crash dump
No response
What version of Sandboxie are you running now?
Sandboxie Plus v1.18.1 64
Is it a new installation of Sandboxie?
I recently did a new clean installation.
Is it a regression from previous versions?
No response
In which sandbox type you have this problem?
In a standard isolation sandbox (yellow sandbox icon).
Can you reproduce this problem on a new empty sandbox?
I can confirm it also on a new empty sandbox.
What is your Windows edition and version?
Win 10 enterprise
In which Windows account you have this problem?
A local account (Administrator).
Please mention any installed security software
Defender
Did you previously enable some security policy settings outside Sandboxie?
No response
Trace log
No response
Sandboxie.ini configuration
Source: sandboxie-plus/Sandboxie