An iPhone screen that starts flickering right after an iOS update should be treated as a software issue first (ifixforu.com), and the first fix is a force restart. If it keeps flickering, turn off Auto-Brightness and True Tone, then use Reset All Settings, which keeps your photos and apps. A flicker that does not show in a screenshot makes a display-side problem more likely, and that may need a repair.
Why an iPhone screen flickers after an iOS update
Flickering here means the picture pulsing, dimming or flashing on its own, rather than lines or patches that stay in one place. An update that did not install completely or settings it left corrupted can each produce it, and ifixit.com notes that this kind can be resolved with standard software troubleshooting such as a force restart (ifixit.com). ifixforu.com describes the same root: software bugs, graphics-rendering glitches or instability from a flawed installation that disrupt how the display’s refresh rate is managed (ifixforu.com).
What to note before you start troubleshooting
Note three things before you change anything. Is the flicker constant, tied to brightness or lighting changes, or confined to one app? Has the screen ever been replaced, and by whom? Does touch still work across the whole screen? A touch screen that stops responding is a different problem with its own guide, and the other answers decide which row of the table below fits you.
Software glitch or failing screen: how to tell the difference
ifixforu.com gives a test that can help distinguish the two: take a screenshot while the screen is flickering and open it on another device. If the screenshot is completely clear, a display-side problem becomes more likely rather than a problem with what iOS is drawing (ifixforu.com). The same page lists other possible signs of a hardware fault: persistent green or purple lines, color bands, or a picture that reacts to pressure near the edges of the display.
| What the flicker looks like | More likely cause | What to try first |
|---|---|---|
| Began right after the update, no lines or bands, shows in a screenshot | Software: incomplete install, corrupted settings or a rendering glitch | Force restart, then the display settings |
| Comes and goes with brightness or lighting changes | Sensor software conflict behind Auto-Brightness and True Tone | Turn both settings off |
| Screenshot taken during the flicker looks clean on another device | Physical display hardware | Book a display check |
| Green or purple lines, color bands, or flicker when you press near the edge | Physical display hardware | Stop pressing on the screen; book a display check |
| Screen was replaced before, or has turned solid white or green | Failing panel, as reported on discussions.apple.com | Panel replacement; say the screen is not original |
How to fix iPhone screen flickering after an update
ioshacker.com lays the software fixes out from the least destructive to the deepest: a force restart, then turning off the automatic display adjustments, then updating any app the flicker appears in, then resetting the system settings (ioshacker.com). Work through them in that order and stop as soon as the flicker is gone.
Force restart your iPhone
A force restart can clear temporary software problems without deleting personal data, according to payetteforward.com (payetteforward.com). On iPhone 8, iPhone SE (2nd and 3rd generation) and Face ID models, press and quickly release Volume Up, press and quickly release Volume Down, then press and hold the Side button until the Apple logo appears. If your iPhone is older than those, use the sequence in Apple’s force-restart guide for your model (support.apple.com).
Turn off Auto-Brightness and True Tone
Both settings adjust the display from sensor readings, and ioshacker.com says that turning them off can help determine whether the flicker is related to these automatic display adjustments (ioshacker.com). Auto-Brightness is under Settings > Accessibility > Display & Text Size. True Tone is under Settings > Display & Brightness. The trade-off is that the screen no longer adapts to the light around you, so you set brightness by hand.
Reset All Settings without losing your data
Reset All Settings returns system preferences to their defaults without erasing your photos, apps or files, per support.apple.com (support.apple.com). It does clear saved Wi-Fi passwords, Bluetooth pairings, keyboard dictionaries and location privacy settings, so have your Wi-Fi password to hand. The path is Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings. A thread on discussions.apple.com points to the same two steps, a force restart and Reset All Settings, as what Apple Support documentation recommends for clearing the corrupted configurations behind display glitches (discussions.apple.com). Do it after the restart and the display settings rather than instead of them, since it is the deepest of the four.
Install the next iOS update
A flicker that arrived with an update may leave with a newer one, so check for a newer iOS version in Settings and install it when one is offered. If the flicker shows up in a single app, update that app too, the step ioshacker.com places between the display settings and the reset.
When the flicker means the screen itself is failing
Reports on discussions.apple.com describe post-update flickering on OLED displays, and on phones with non-original replacement screens, escalating into a permanent white or green screen that needed a full panel replacement (discussions.apple.com). Those are individual reports rather than a rule, so they should not be treated as proof that a flickering screen will fail. If the screenshot test comes back clean, or you see lines, bands or a picture that reacts to pressure, a display check is the next action.
Aftermarket screens and iOS updates
The reports that ended in a panel replacement include phones whose screens had been replaced with non-original parts. The software steps above are still worth doing first because they are free, but when you book the check, tell the provider the screen is not original and when it was fitted.
Should you wait for a fix or get the screen replaced
Continue software troubleshooting when the flicker shows up in a screenshot and began with the update: apply a force restart, turn off display adjustment features like Auto-Brightness and True Tone, update affected apps, and use Reset All Settings if needed. Book a display check when the screenshot is clean or the screen shows persistent lines, color bands, or pressure sensitivity, as these make a physical display problem more likely; note that some individual reports of post-update panel failure have escalated to solid white or green screens. If the flicker survives a force restart and Reset All Settings, or the screen has gone solid white or green, stop troubleshooting and book a display check with Apple or an authorized repair provider, and tell them whether the screen has ever been replaced.### Will Apple replace a screen that started flickering after an update for free?
Whether a replacement is covered is decided at the check, by your warranty or coverage and by what the technician finds. Bring the phone with the flicker showing if you can, bring a screenshot taken during it, and say whether the screen has ever been replaced.
Why does my iPhone screen flicker only at low brightness?
Turning off Auto-Brightness and True Tone can help determine whether the flicker is related to these automatic display adjustments, so turn both off and set the brightness by hand at the level where it flickered. If it still flickers there, run the screenshot test and treat a clean screenshot as a reason to book a display check.
Is it safe to keep using an iPhone with a flickering screen?
The software fixes are safe to try and none of them erases your data. A persistent hardware-related flicker should be checked rather than ignored, particularly if the screenshot test points to the display or the screen develops lines, bands, or other persistent changes.