Here are two ways that a hard reset Huawei Y600-U20 can be achieved.

warning: a hard reset erases all data so its advisable to have a backup first.

Method 1:

1  Ensure that the phone is on.
2   From the home screen open MENU then select SETTINGS.
3  Then select BACKUP&SELECT and then select FACTORY DATA RESET.
4   select RESET PHONE then tap on ERASE EVERYTHING.

In a short while the hard reset process will begin .

Method 2:

1  First switch off the phone by holding down the POWER OFF switch for a few seconds.
2  Now Press the Volume Up and Power buttons at the same time for about 5 seconds.
3  Release the keys when the black ‘Recovery Mode’ screen shows up.
4  Select the FACTORY RESET using the volume keys to navigate and the power button to confirm selection.
5 Select YES–DELETE ALL USER DATA using the sideways volume buttons to navigate and power button to confirm selection.
6  Select the REBOOT SYSTEM NOW to restart.

Restarting the phone begins the hard reset.