Hi I had iPhone 12 Pro Max I try to reset it but apple logo keep flashing

Hey ThanhDTrinh,

We'd recommend reviewing this article as it provides steps to take to help resolve issues with your iPhone being stuck on the Apple logo: If your iPhone is stuck on the Apple logo - Apple Support

"If you have iOS 13 or later, and tried to restore your iPhone from a backup or tried to migrate your iPhone from a previous device, you might see the Apple logo and progress bar on your screen for more than one hour. Learn what to do.

If you have the issue above, follow these steps:

1. Make sure that the progress bar on your iPhone screen hasn't moved for at least one hour.
2. If the progress bar hasn't moved for more than one hour, connect your device to a computer, then put your device into recovery mode with these steps:

• iPhone 8 and later: Press and release the Volume Up button. Press and release the Volume Down button. Press and hold the Side button. Keep holding the Side button until you see the recovery mode screen.
• iPhone 7 and iPhone 7 Plus: Press and hold both the Volume Down button and the Sleep/Wake button. Keep holding the Volume Down button until you see the recovery mode screen.
• iPhone 6s and earlier: Press and hold both the Sleep/Wake button and the Home button. Keep holding the Home button until you see the recovery mode screen.

1. On a Mac with macOS Catalina 10.15 or later, open the Finder. On a Mac with macOS Mojave 10.14 or earlier, or on a PC, open iTunes. When asked to update or restore, choose Update. This will update your device to the latest version of iOS. If you choose Restore, it will erase your iPhone."

Thanks!