@Solla-topee 

Hi, already tried all those steps, didnt help. After reset, i can connect camera to wifi with wps button on device. Then on Android mobile device tpcamera app detects the device and asks for admin pass. It doest accept default pass admin. But using firefox on windows i can access the web interface with default password "admin". After changing default password, same issue on mobile app.

Its clear device can be accessed with default pass and even get new pass update. But no matter what mobile app doest allow user access. All these mean most likely tpcamera app is the problem.

Can tplink support raise a ticket for this issue to get checked and hopefully get resolved please?

https://www.tp-link.com/us/support/faq/821/

As above picture from tpcamera guide suggests there is a set password stage after detecting camera for the first time. But this phase is not coming thru anymore no matter what. Instead, enter password screen comes as if a password has already been set. Factory default password supposed to be "admin" but tpcamera app keeps giving error "incorrect password" whereas same default password can be passed from web ui. I can see tpcamera app sends/recieve packets over the network during password entering. Note that same issue on another android device. These suggest there is a bug problem.

Will Tplink investigate and solve this problem?