If your iPhone won’t force‑restart, then the update failed and the phone is stuck in a partial install state.
1 Try a force‑restart again (timing matters):
• Press and release Volume Up ➡️ press and release Volume Down ➡️ hold Side button for 30–40 seconds until the screen goes black and the Apple logo reappears.
(If the screen never goes black, keep holding — many users release too early.)
2 If it still won’t restart, connect the iPhone to a Mac or PC.
• Open Finder (Mac) or Apple Devices app / iTunes (Windows).
• Keep the iPhone connected.
• Put the iPhone into Recovery Mode manually:
• Press and release Volume Up.
• Press and release Volume Down.
• Hold Side button until you see the computer + cable Recovery Mode screen.
• When the computer prompts you, choose Update (not Restore).
This reinstalls iOS without erasing data.
3 If Update fails or the phone exits Recovery Mode, repeat the steps and choose Restore — this erases the device but fixes the firmware.
If the iPhone still won’t complete the update or restore, there may be a deeper hardware or firmware issue.
• Contact Apple Support for further diagnostics or in‑store service 👉 https://support.apple.com
Axel F.