[Q] ifive mini 2 wifi problem topic

hi guys good day! .it is running on jellybean 4.1.1 and equiped with rk3066 chipset.the problem is when im far from our wifi router like 5 meters away my wifi signal drops to 1 bar i have already updated our router to the latest firmware but unfortunately the problem still exist. i think my tablet's wifi driver is the problem. .is there anyone could help me to fix this problem? thank you :) im willing to upload my wifi driver for you to modify it i know that there are lots of devs here in xda that could help me.