If you remove all SD cards and USBs and attach the UART cable (which WeTek shipped with the box) you'll see the box fail to boot .. as there is no longer a bootloader. Now if you write the SD card using my wp2 image it should boot (from the SD card) and you'll see UART output. NB: I didn't test the WP2 for a few weeks (as moved back to RPi4 for a bit) but i'm not aware of anyhing that changed enough to break boot.
I thought I did, but the sound is not working