No HDMI after BIOS 1.14.2, downgrading to 1.12.1 solved it.

There 's a subject on Reddit. Looks like you're not the only one.

I'll wait a fix for this fix...

Same Here

No HDMI, downgrading to 1.12.1 solved even if it sais failed the update.

Please DELL fix it to update a new BIOS.

Regards Massimo.

The 2 Dell software updates on 5/4 bricked my XPS15 9560. I assume this included the new v1.14.2 BIOS update, but didn't confirm prior to install. Post update boot, I got Windows Blue Screen, and Dell diagnostics reporting memory failures. BIOS rollback and restore options all appeared to fail too, and what was showing was v1.12.1 was active (14 install may have failed.) Was about to mail the laptop in, and gave it one last try - surprise, BIOS 1.10.1 rollback worked and laptop is once again fine. v1.14.2 needs to be tested further and fixed.

FWIW, I don't know if the HDMI port was also affected through the USB hub I use because I was focused on the other critical fatal errors.

Some pictures of event errors.