Roblox FastFlag: FFlagDebugHumanoidPhysicsDisabled
Status: PROHIBITED & BLOCKED on live production servers. Attempting to force this flag in ClientAppSettings triggers immediate client disconnection with Error 268.
Roblox FastFlag FFlagDebugHumanoidPhysicsDisabled is an internal FFlag engine configuration parameter audited by Telemetry Lab. Its official 2026 allowlist status is BLOCKED_PATCHED, with a factory default value of "False" and a recommended performance value of "False".
| Telemetry Metric | Verified Value |
|---|---|
| FastFlag Name | FFlagDebugHumanoidPhysicsDisabled |
| Data Type | FFlag |
| 2026 Allowlist Verification | BLOCKED_PATCHED |
| Engine Subsystem Category | Physics & Engine |
| Engine Default Value | False |
| Recommended Value | False |
| Safety Risk Level | Prohibited |
| Tested Production Build | version-9ac8595712b447a7 |
Ready-to-Use ClientAppSettings.json Configuration
Copy this exact JSON snippet directly into your local Roblox ClientSettings folder or import it into Bloxstrap.
{
"FFlagDebugHumanoidPhysicsDisabled": "False"
}%localappdata%\Roblox\Versions\version-9ac8595712b447a7\ClientSettings\ClientAppSettings.jsonEngine Subsystem & Technical Deep-Dive
Internal test flag reserved exclusively for Roblox engine architects. Tampering with this on live production servers triggers Byfron integrity fault 0x80000003.
Engine Impact: Internal developer flag to disable humanoid collision physics.
How to Apply FFlagDebugHumanoidPhysicsDisabled (Two Methods)
1Standard Roblox Client (Manual Method)
- Press Win + R, type
%localappdata%\Roblox\Versions, and hit Enter. - Open the active version folder containing
RobloxPlayerBeta.exe. - Create a new folder named
ClientSettings. - Inside, create a text file named
ClientAppSettings.json. - Paste the JSON snippet above and save the file.
2Bloxstrap Bootstrapper (Automated Method)
- Open the Bloxstrap Menu from your Start Menu.
- Click on the Fast Flags tab in the sidebar.
- Click on Fast Flag Editor.
- Click Import JSON and paste the snippet above.
- Click Save and launch Roblox.
Byfron Hyperion Anti-Tamper & Ban Safety Attestation
Notice: Because this flag is categorized as Prohibited, overriding it on active production servers may cause unexpected visual artifacts or physics desynchronization. If you encounter crashes, delete ClientAppSettings.json to restore default behavior.