stlink: Unknown chip id 0!

• Programmer/board type: e.g Stlink/v1, Stlink/v2, Stlink/v2-onboard
• Programmer firmware version: e.g STSW-LINK007 2.27.15 -> Unknown
• Operating system: e.g Linux, Mac OS X, Windows (with specific version) -> macOS 10.11.6
• Stlink tools version and/or git commit hash: e.g v1.1.0/git-c722056 -> v1.3.1
• Stlink commandline tool name: e.g st-info, st-flash, st-util-> st-flash
• Target chip (and optional board): e.g STM32F402VG (STM32Fxxx Discovery) -> STM32F405 – This is a custom board, possible there is a design error but would like to confirm here first.

Output:

st-flash --reset write main.bin 0x08000000
st-flash 1.3.1
2017-07-18T16:56:28 INFO src/common.c: Loading device parameters....
2017-07-18T16:56:28 WARN src/common.c: unknown chip id! 0

Expected/description: Expecting the device to have to program loaded into flash. This is a custom board, as mentioned above. It is possible there is a design error. I am not too familiar with the way the STM32F4XX series works and may not have the knowledge to diagnose the issue myself. If there are resources beyond which I have found, I will gladly read up on them.