1 Copper

RE: Updated XPS 18 BIOS to A06, won't charge in cradle

The BIOS isn't the problem, but most likely the problem is due to the way the cradle connects to the tablet. If you don't get ithem matched up perfectly, the cradle and tablet connectors get misaligned, and the resulting mismatch causes power to go to the wrong pins, damaging the motherboard.  The power jack will still allow charging, but the damage to the motherboard doesn't allow charging in the cradle.