Flashing the Firmware BigTreeTech TFT35 V3

Hello, I have a BTT TFT E3 V3 screen which has the wrong firmware loaded on it.

The normal “insert the SD Card in the device” solution does not work, neither does resetting the device. I have purchased a ST-Link v2 kit, so I can re flash the firmware directly, using the ST-Link software.

Does anyone have any notes / instructions /files / procedures on how to do this, please?

I’ve been in touch with BTT tech support and have spent a week in answering questions that are not relevant to my case

Thanks in advance for your help.