Wanted to update the software now available, but it is asking for a pass code. As far as I remember in didn't put in any pass code , how do I settle this issue . Earlier updates were asking Apple ID but pass code for updating the new soft ware not known.

Hello Kewal,

Thank you for the details of the issue you are experiencing when trying to perform an update. I recommend trying to update using iTunes, and as always, it is a good idea to make a backup first.

iOS: Back up and restore your iOS device with iCloud or iTunes

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

Update your iPhone, iPad, or iPod touch

http://support.apple.com/kb/ht4623

Thank you for using Apple Support Communities.

Best,

Sheila M.

It should be the passcode 4 digit used to wake/unlock your ipad

The passcode is the four digit number that you enter after an Autolock on your device or when you first turn it on. If you can't remember that code you'll have to restore your iPad before you can do the update.

http://support.apple.com/kb/HT1212