"Can't Establish A Reliable Connection To The Server" [Fix]

1. ROOT your device (of course)

2. Editing the file
You will need a proper editor 
Download and Install Total Commander and open it
OR DOWNLOAD BELOW

3. Browse with Total Commander to root/etc
(hint: on the right side of the screen there's a shortcut to system folder.. look for etc/ and you will find it)
Tap mount R/W 
Long tap on "hosts" > edit file > Totalcmd-Editor

Open etc/hosts and edit the file. Just put # before 74.125.93.113 android.clients.google.com. 

4. SAVED

Edited file should look like this:

127.0.0.1 localhost
#74.125.93.113 android.clients.google.com 

remember: based on my own observation it should be look like this:

127.0.0.1(just one space)localhost
#74.125.93.113(just one space)android.clients.google.com 

5. Turn OFF your device.
6.(Not Necessary, Go to Next Step. But if the problem persist do Factory Reset..) Got it on Recovery Mode, Factory Data Reset, wipe data. 
7. Reboot your device.
8. Once the phone reboots, input your google account information when the phone asks for it.
9. Sync to your account and contacts

Alternative Way

1. ROOT your device (of course).

2. Instead of editing the host file Delete the file.

3. I would prefer you to use Es File Explorer as Total Commander didn't delete the file properly.

Long tap on "hosts" > delete.

5. Turn OFF your device.
7. Reboot your device.
8. Once the phone reboots, input your google account information when the phone asks for it.
9. Sync to your account and contacts

Downloads

Total Commander

Es File Explorer