Help: accidentally bricked by Nordic software

[aceslick911]

Hi,
I accidentally bricked my Go by trying to use the Nordic Semiconductor Bluetooth Low Energy app which asked to flash my device which I said yes to.

It threw an error and now I can't get the device into dfu anymore similar to this issue: https://community.makerdiary.com/t/pitaya-bricked-during-first-programming-attempt/290

Is there any way to get the old firmware back? I got a swo and jtag debugger (flirc Jeff probe) but I don't know which wires to connect or what to do :(