[header] How to reset a blackberry [title] Open the battery cover on the back of the blackberry. [step] Remove the battery from the phone. [substeps] You can perform a hard reset on the blackberry z10 by pressing and holding the power button on the top of the phone for about 10 seconds. 
[title] Reinsert the battery after a few seconds. [step] To be on the safe side, wait for up to 30 seconds and then reinsert the battery into the back of the phone.