If you still have Samsung Care+ you can use it. 😊
We apologize for the inconvenience it caused you upon hearing about your experience with the recent updates on your beloved Samsung Galaxy S21 Ultra having issues with green vertical line on screen.
I really understand what you are feeling right now, expecting your device to perform better after an update but turns out it gives you this green light on display instead. If it happens on my device, I will be frustrated too.
To pinpoint the exact root cause of the problem, may you please submit an error report through the Samsung Members app as follows:
Step 1. Long press Samsung Members icon on Apps screen and tap Error reports.
Step 2. Tap OK on agreement popup to send system log data.
Step 3. Select Symptom category "Display".
Step 4. Describe the problem in details and SEND.
How to submit an error report on Samsung Members app? | Samsung PH
Should you decide to have it check and assess by our competent Samsung engineers and technicians, you may bring it to the nearest Samsung Authorized Service Center in your area.
For more assistance and guidance, you may contact us via our online Samsung Customer Care support channels below.