v1.0.0

First release.

Tray switch for the Dell BIOS fan override (FanCtrlOvrd): forced full speed, or the firmware curve. There is no "off" state and no percentage — the BIOS exposes only these two.

Download FanSwitch-v1.0.0.zip, extract, run FanSwitch.exe, accept the UAC prompt. Right-click the tray icon and choose Start with Windows to persist it.

Requirements

• Dell business system (OptiPlex, Latitude, Precision) whose BIOS exposes FanCtrlOvrd — this varies by model
• Dell Command | Configure installed (provides cctk.exe)
• Administrator rights; cctk needs elevation even to read a setting
• No BIOS setup password
• Dell Command | Monitor is optional, and only powers the RPM and temperature readout

Check support with:

& "C:\Program Files (x86)\Dell\Command Configure\X86_64\cctk.exe" --FanCtrlOvrd

If the .exe will not start

The binary is unsigned. On managed machines an EDR or application-control policy may block it with Access denied and no visible error. Use the PowerShell build included in the zip (powershell/install.ps1), which runs under Microsoft-signed powershell.exe, or ask IT to allow the binary by hash.

SmartScreen will also warn on first run: More info → Run anyway.

Notes

• The .exe in this release was compiled and verified to build cleanly, but it could not be executed on the development machine because of the application-control policy described above. The PowerShell build is the one that has been exercised end to end.
• Writes are verified against cctk output rather than assumed to succeed, so a refusal (BIOS password, unsupported model) is reported instead of silently showing a state that never changed.