[oluwasegun]

My Google playstore app can not open again.... It shows me that(can't establish a reliable connection to the server) pls help me...

[xerxes]

My Google playstore app can not open again.... It shows me that(can't establish a reliable connection to the server) pls help me...

That's network connection issue. Try again with another network or WiFi

[oluwasegun]

Have used all network and many wifi with it after i have hard reset it many times

[xerxes]

Have used all network and many wifi with it after i have hard reset it many times

Do you have Chrome in your phone and are you able to browse with it?

[oluwasegun]

I have it before on my phone before I reset my phone and it not working...

[xerxes]

I have it before on my phone before I reset my phone and it not working...

You will need to flash gapps through custom recovery. 
State your device
chipset
android version 
build no. 
also, is your device rooted.

[hovatek]

My Google playstore app can not open again.... It shows me that(can't establish a reliable connection to the server) pls help me...

Refer to https://forum.hovatek.com/thread-164.html

[oluwasegun]

Have followed d steps.... Still samething

[hovatek]

Have followed d steps.... Still samething

Which of the methods did you use?

[oluwasegun]

1 and 2