Hi dansinclair25
As @MichaelMKKelly has correctly pointed out, we DO NOT recommend opening up the plug. Mains voltage is scary!
However, could you confirm what firmware was on the device before you flashed Tasmota Minimal? If it was ESPHome, the device is probably unrecoverable. If it was Tasmota, it should have retained your WIFI credentials and connected to it.
For future reference, we have a video guide showing the process here!