Huawei U7520 hard reset
Select Security > Phone and SIM card > Factory default.
Enter the password of your phone to restore factory defaults. The initial password is 0000.
On the dial screen enter this Huawei U7520 hard reset reset code: ##258741 then press CALL button.
Warning! All your data including contacts will be lost, so back up all your data before doing a Huawei U7520 hard reset / full reset.
If you know Huawei U7520 hard reset using buttons / keys pls leave comment.