Screen flashes green on Galaxy A57 5G
If your Galaxy A57 5G screen briefly flashes green when you turn it on, updating your device to the latest software version can quickly resolve the issue.
Swipe down from the top right corner of the screen to open the Quick panel, and then tap Settings. Tap Security and privacy, and then tap More security settings. Tap Secure Folder. If Secure Folder was set to hide, tap Show from the pop-up.

Within Secure Folder, tap on the More options (the three vertical dots) icon in the top right corner, and then tap Settings from the menu.

Turn on the switch labeled Allow background activity while locked.

Swipe down and tap Other security settings, and then turn on the switch labeled Show Secure Folder apps in share panel.

Select CONTINUE to visit HP's website.