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DELL E7480 BIOS update 1.5.2 causes SERIOUS PROBLEMS to Thunderbolt (USB-C) Docking

This update caused me:

1) Lagging of mouse cursor and wireless keyboard connected via docking stand DS1000

2) Popping/crackling sound from Dell soundbar AC511 connected via DS1000

3) Random interruptions of Ethernet via DS1000

I tried to update or change related drivers, change DS1000 for another HW without any success.

BIOS DOWNGRADE to previous 1.4.6 FIXED all above.

1.5.2 should be fixed immediately since it contains serious bugs.

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