need help

Could anybody help me in reformatting my mobile phone’s memory card? The problem is that it is prompting for a password which I have no idea after I updated my phone software

is this a nokia phone?  you will have to use an external card reader to format it… if you are using a PC, go to ‘My Computer’, right click on the removable drive and choose format, there you will have more options about the format then click on START.  If you are using a mac, go to disk utility and click on the drive you want to erase.  go to the erase tab and you will see another erase button at the bottom right side of the screen. make sure that format is set to MS-DOS.