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After updating my iphone i got three green stripes on my display of my IPhone 10 Max.
they run 1” from the right side of the screen from top to bottom with sometimes flickering a fourth line in the middle of the screen.
iPhone XS Max
you may have a hardware problem.
First try a forced restart
https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios
If that does not help the next procedure would be to backup then restore your device to factory, and setup the device without restoring a backup, to see if the issue is replicated.
Then restore the backup.
Here is a guide for those steps
Backup and restore
(1)How to back up your iPhone, iPad, and iPod touch – Apple Support
(2) Restore your iPhone, iPad, or iPod to factory settings – Apple Support
(3) Restore your iPhone, iPad, or iPod touch from a backup
If that fails arrange a repair
you may have a hardware problem.
First try a forced restart
https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios
If that does not help the next procedure would be to backup then restore your device to factory, and setup the device without restoring a backup, to see if the issue is replicated.
Then restore the backup.
Here is a guide for those steps
Backup and restore
(1)How to back up your iPhone, iPad, and iPod touch – Apple Support
(2) Restore your iPhone, iPad, or iPod to factory settings – Apple Support
(3) Restore your iPhone, iPad, or iPod touch from a backup
If that fails arrange a repair
Green stripes appeared after software update
