is icloud password required for update ios?

Yes, as I already said. When the device reboots and starts up the new iOS 10.2.1 you will be prompted for your iCloud password when it gets to the step of updating your iCloud settings.

Not recalling your AppleID password for iCloud is inevitably going to cause you issues. You need to recover that account - see https://iforgot.apple.com/password/verify/appleid. (And by any chance is it the same AppleID and Password you just used to login and post here?).

When choosing to install the update over the air on the device, you will be prompted for your device screen lock passcode.

Once the install completes and the device reboots, you are prompted for your iCloud account password to update your iCloud settings.

No, you will need only the unlock code for the phone if it has one.

Use the link in the post right above yours and recover the AppleID you use with iCloud. That is your only solution here.

are you sure??

Hey buddy i have same problem

Plz give me the sol

M711M699m