Q: Good day! All of my data was deleted after i update my os to os5.1.1. from then on I didnt restore it again. Today, I accidentally restored my iphone and all of my recent photos were deleted. how can I retrieve it again? thanks!

If you have been regularly syncing/backing up your iPhone with iTunes or iCloud, you may try restoring it from the last backup.

Read how to restore from a backup.

http://support.apple.com/kb/ht1766

Make sure to turn OFF automatic syncing in iTunes before connecting your iPhone.

Preferences - devices - "check" prevent iPhone/iPod from automatic syncing

Unfortunately, your pictures are gone.

To avoid such problem in future, sync/back up your iPhone regularly with iTunes or iCloud. It is also a good practice to take periodic manual back up of all your photos and videos on your computer.