Well I didn't wait for a response and reflowed the chip with my 40 wt soldering iron and surprisingly it worked! I continuously moved soldering tip across the chip surface for about 5 minutes and then repeated after 2 min break. Now both wifi and bluetooth work perfect. Thanks for the guide!

None of my friends have the air reflow station. Could anyone please tell if I can use a soldering iron to heat the chip instead? Is it supposed to reflow correctly with a soldering iron attached to it for some time?