Can't write bitstream to ZCU216 using qpsk_overlay()

I used Pynq v2.7 and I write the bitstream in this website (GitHub - strath-sdr/rfsoc_qpsk at ff4f4d3b6aa3ae20dd62cda0744fd7e2cb6ca723 )to RFSOC ZCU216.
When I compile ‘ol = QpskOverlay(init_rf_clks=False)’ and the Jupyter notebook shut down I can’t connect to Jupyter until I turn off the board and restart it.
Could anyone tell me what happened?
Thanks!

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