Similar to i Phone, you can also update i Pad with i Tunes.Make sure you take a backup of your data using i Tunes or i Cloud before updating your device.Apart from these advantages, your device also gets automatically synced as well as backed up in the updating process.
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Then you have to manage notification coming on your i Phone and i Pad device for other third-party apps only.
Sometimes these features are something for which users wait for ages, and sometimes it's just a namesake update.
If your settings Ok, mean already enabled, then ignore this way and try to rebooting your i Phone or i Pad.
Now you are done, you should be able to receive notification when Lock screen notification not working in i OS 8 / i OS 7 i Phone and i Pad.
By default lock screen notifications is to be turned on.