Stm32f103 OB(Option Byte) Functions Problem

You didn't include any code.

SPL isnt supported anymore, although it’s surprising it doesn't support something on the F1 series. You’ll have to write it yourself or migrate to HAL.

 The table below presents the list of available functions depending on the used STM32F10x devices.
 
 ***************************************************
 * Legacy functions used for all STM32F10x devices *
 ***************************************************
 +----------------------------------------------------------------------------------------------------------------------------------+
 | Functions prototypes |STM32F10x_XL|Other STM32F10x| Comments |
 | | devices | devices | |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_SetLatency | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_HalfCycleAccessCmd | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_PrefetchBufferCmd | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_Unlock | Yes | Yes | - For STM32F10X_XL devices: unlock Bank1 and Bank2. |
 | | | | - For other devices: unlock Bank1 and it is equivalent |
 | | | | to FLASH_UnlockBank1 function. |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_Lock | Yes | Yes | - For STM32F10X_XL devices: lock Bank1 and Bank2. |
 | | | | - For other devices: lock Bank1 and it is equivalent |
 | | | | to FLASH_LockBank1 function. |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_ErasePage | Yes | Yes | - For STM32F10x_XL devices: erase a page in Bank1 and Bank2 |
 | | | | - For other devices: erase a page in Bank1 |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_EraseAllPages | Yes | Yes | - For STM32F10x_XL devices: erase all pages in Bank1 and Bank2 |
 | | | | - For other devices: erase all pages in Bank1 |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_EraseOptionBytes | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_ProgramWord | Yes | Yes | Updated to program up to 1MByte (depending on the used device) |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_ProgramHalfWord | Yes | Yes | Updated to program up to 1MByte (depending on the used device) |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_ProgramOptionByteData | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_EnableWriteProtection | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_ReadOutProtection | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_UserOptionByteConfig | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_GetUserOptionByte | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_GetWriteProtectionOptionByte | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_GetReadOutProtectionStatus | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_GetPrefetchBufferStatus | Yes | Yes | No change |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_ITConfig | Yes | Yes | - For STM32F10x_XL devices: enable Bank1 and Bank2's interrupts|
 | | | | - For other devices: enable Bank1's interrupts |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_GetFlagStatus | Yes | Yes | - For STM32F10x_XL devices: return Bank1 and Bank2's flag status|
 | | | | - For other devices: return Bank1's flag status |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_ClearFlag | Yes | Yes | - For STM32F10x_XL devices: clear Bank1 and Bank2's flag |
 | | | | - For other devices: clear Bank1's flag |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_GetStatus | Yes | Yes | - Return the status of Bank1 (for all devices) |
 | | | | equivalent to FLASH_GetBank1Status function |
 |----------------------------------------------------------------------------------------------------------------------------------|
 |FLASH_WaitForLastOperation | Yes | Yes | - Wait for Bank1 last operation (for all devices) |
 | | | | equivalent to: FLASH_WaitForLastBank1Operation function |
 +----------------------------------------------------------------------------------------------------------------------------------+