Restoring all messages on messenger
On apple ipad
iPad
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I am hoping that by "messenger" you meant the Apple Messages app and by messages you meant deleted messages. If so, then this might be of some help: Recover deleted messages in Messages on iPad - Apple Support (IE) or this: How do I restore message in messenger af… - Apple Community
And if by "messenger" you meant the Facebook Messenger, then this thread might be of some help to you: How to restore chat in mesenger app - Apple Community
If it is none of the above, can you provide more details about your question?