I have exactly the same problem. Being a certified Windows systems administrator, I'm quite puzzled that it won't install.
Is there a way to unpack the executable and just manually install the driver through Device Manager?
However, on the XPS17-L702x this A12 driver for the DW5540 MBB card gets the
same Setup Error that the A11 driver gets - ' Authentication failed. The Dell HSPA
Mini-card drivers cannot be installed on this computer. Please contact Dell Support...'
But when I used the A00 driver for the DW5541 card then it installed correctly....
I have the same probleme with my M6500, I tried it all, from Bios upgrade to re installing the system 3 times, It's a brand new card.
I get the Authentication failed
if anyone has a clue !!
Would really help out !!
Thank you all in advance,