You can't upgrade the existing WIFI adapter. You may be able to replace the internal WIFI adapter. If that isn't possible you can get a dual band USB WIFI adapter and disable the internal WIFI.
You can't upgrade the existing WIFI adapter. You may be able to replace the internal WIFI adapter. If that isn't possible you can get a dual band USB WIFI adapter and disable the internal WIFI.
you can't modify the adapter to gain that ability and most laptops put restrictions in the BIOS that will not allow you to change out the wifi adapter inside the laptop so a USB wifi adapter would be your easiest option.
here is a low profile one that has the AC (5GHZ) band you're looking for:
External USB -- Amazon, NewEgg. Make sure the description says "dual band".
An internal replacement, you should google the exact laptop model with wifi replacement. There may be soldering required.