I had the same problem. My DW1830 stopped working after 10.14.6 update and restoring macos (and changing Clover EFI version) from backup.
After some experiments, I ordered native Mac BT card and M2 extension to replace DW1830.
Today I found solution that worked (make sure that DW1830 card is...
Thank you, mm2Margaret for help - I followed your instructions and upgraded to 10.13.3 after 3 or 4 unsuccessful attempts with rollbacks;
I am using NVidia 104 driver.
PS When EmuVariableUefi-64.efi was not removed, my box hanged on startup after patching using webdriver.sh and restart.
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