My IPhone updated and afterwards all my data got erased like messages and all my apps what can I do ?

Do you have a backup you can restore from? Restoring from a backup erases all data currently on your device. Any data newer then when the backup was made will be erased. A restore is an all or nothing restore. You can't access a backup to see the contents and only restore certain files.

Backup - Restore your device from an iCloud or iTunes backup.    *

ASC YouTube for how to restore an iPhone, iPad, or iPod touch from an iCloud backup