Yes, the firmware had been updated to the latest version (2.0.1 Build 20171225 Rel. 60160). I did mention about it on the original post.

Suddenly my TL-WR941HP router could crash itself when I browse this website: http://psref.lenovo.com/ The router will restart itself when it happens. I can't find anything useful from the router's...

Try email the tp-link support, usually they are more responsive on email. If you got the answer, please let me know.

I suggest to email the tech support to get faster response. Seems the TP-link staff seldom look into this forum, I opened an issue thread about 1 month ago, none of the staff ever responded there.

@tungnt Sorry I don't use VPN. About the hardware version, I emailed the tech support, they said the correct version is the one showed on the sticker label, so the correct version is V2 in my case.

^About turning off WPS, that's not the correct way. I have found the correct way is from the "System Tools" -> "System Parameters" menu, there is an "Enable WPS" checkbox there. It' such a terrible...