ST STM32F4 Option Bytes Unlock
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The option bytes of the STM32F4 series of devices can be reset to default values. SEGGER implemented support for these features via a dedicated utility called Device Provisioner. For more information about this, please refer to the Device Provisioner article. STM32F4 Option Bytes Reset features are implemented in the PCode_DevPro_ST_STM32F4.pex script file.
Usage
DevPro -operation [operation_name] -if SWD -speed 4000 [parameter_name=value] -ScriptFile PCode_DevPro_ST_STM32F4.pex
| Operation | Parameters | Values | Description |
|---|---|---|---|
| PerformUnlock | - | - | Unlocks the device by resetting the option bytes to default values. |
Examples
Option Byte Reset
Example
DevPro.exe -operation PerformUnlock -if SWD -speed 4000 -ScriptFile PCode_DevPro_ST_STM32F4.pex
SEGGER Device Provisioner V8.54
Compiled Jul 29 2025 15:57:59
Command line: -operation PerformUnlock -if SWD -speed 4000 -ScriptFile PCode_DevPro_ST_STM32F4.pex
Firmware: J-Link V12 compiled Jul 21 2025 13:15:53
S/N: 602004466
J-Link log: Reset: Halt core after reset via DEMCR.VC_CORERESET.
J-Link log: Reset: Reset device via AIRCR.SYSRESETREQ.
J-Link log: Reset: Halt core after reset via DEMCR.VC_CORERESET.
J-Link log: Reset: Reset device via AIRCR.SYSRESETREQ.
J-Link log: Reset: Halt core after reset via DEMCR.VC_CORERESET.
J-Link log: Reset: Reset device via AIRCR.SYSRESETREQ.
J-Link log: Option bytes reset successfully!