so the latest V5 year 2016 firmware confirm cannot update, unless not using wifi?

after the update, my lan speed improved a lot, but wifi is weak, coverage area is shorter. used to have good signal in bedroom upstairs but now it is impossible to get it. what can i adjust to improve signal coverage?

your post should be referred to on post #1
thank you in advance too on be half of everyone else using this info

I hate this piece of shiit. Now i hv to reset it almost every day in order for it to work. If not, it will hang and either:
- cannot even see the ssid online, or
- can connect to modem but cannot online

using LAN cable, connect to modem, go to setting and reset everything back to factory, do the whole setup once more, then it is fine. what kind of non-sense is this? why suddenly i hv to do all this? for the past few weeks it has been fine.