Hard reset samsung duos to remove pattern screen lock or slow speed off mobile.In case off slow working of mobile you can reset mobile via settings, if mobile pattern screen lock lost or forgot  and you also not know your your gmail account then we can reset lock by keys.
Note:  Before do that take backup of your important data, phonebook, messages, images, and take out sim card and SD Card.Because after hard reset it is not possible to recover all data so it is important to take backup of all your data.

Press power key suddenly press vol plus and home key (center key )

after on display release only power key not vol up and home key
after that phone show whipe data factory reset 

use up down for volume key
press power is for ok

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