Some more info:
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peripherals: wireless keyboard/mouse usb reciever, DP to HDMI cable, mini usb to usb cable for serial console logs, usb type-c power cable.
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tried flash 5.1.1 quite a few times using vm ubuntu 20.04, all same result: can’t start using direct boot, and end up in attemptting recovery boot mode. even recovery boot mode won’t show any shell on display. So display loses signal.
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tried falsh 5.1.1. from vm ubuntu 18.04 (upgrade to LTS following this thread), but still same boot up issue
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tried flash JP5.1.1 using direct ubuntu host 20.04 without vmware, same boot up issue
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tried to boot with ethernet cable connected, same issue
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tried to flash 5.0.2 from vm ubuntu 20.04, same issue