One of foxflash users’ bench box stop working. He got it fixed.
Possible reason:
the relay didn’t send 12v to ECU or the P channel mosfet burned.
Case 1: The relay didn’t send 12v to ECU.
The relay gives power.
The blue bench box, the relay is the one that sends the 12 VDC to the ECU. If there is no 12v, it is impossible to connect to the ECU.
Case 2: P channel near the relay mosfet burned.
Change it: DMP3010LK3-13, MOSFET P-CH 30V 17A TO252-3
At better install 5A fuse, to powerline after box.
https://www.iecutool.com/service/foxflash-bench-box-stop-working-solution.html