After an hour on the phone with lenovo trying to find an alternative to hacking my laptop and voiding warranty i found the only solution. Im sure most of you have already been successful with hacking but I for one am not ready to risk it just yet. The alternatives are finding approved wireless cards within the lenovo manual here : http://download.lenovo.com/consumer/mobiles_pub/ideapad_y400y500_hmm_1st_edition_sep_2012_english.pdf on page 79 I managed to find only 2 network cards that will work with dual band routers. WLAN, WiFi 2x2 ABGN+BT4.0 Cbt BCM943228HMB Broadcomm ac but as far as I know its only 300mb 2x2ABGN+BT4.0 HMC item number: 20200221 priced at $54 dollars USD and WLAN, WiFi 2x2 ABGN+BT4.0 Liteon WB222 not much information can be found for this 2x2ABGN+BT4.0 HMC item number:20200225 priced at $34 USD. on top of that it is at least 10-16 dollars shipping depending on how fast you want it. I was hesitant to purchase them as I have already ordered an intel 7260 ac but had the stupid error network card not compatible. However, I managed to claim to Lenovo that my card was not working and the woman on the phone said that since my computer was under warranty they could send me one of the 2 cards instead of the piece of crap that it came with, I will update if it goes through. But for now I will continue to research an alternative to hacking the bios, I don't like the risk of a $2k paper weight