If your Xiaomi 15 Ultra keeps forgetting Wi-Fi passwords, reconnecting can become a daily annoyance.
You enter the password, the phone connects, and then it forgets everything after a restart or when Wi-Fi turns off.
This problem is usually caused by system settings, aggressive battery optimization, or corrupted network data, and it is fixable with a few focused steps in 2025.
Why Your Xiaomi 15 Ultra Won’t Save Wi-Fi Passwords
- Battery optimization is restricting background system services.
- Wi-Fi assistant or network switching features are interfering with saved networks.
- Corrupted Wi-Fi cache or network configuration.
- System permissions are blocked for core connectivity services.
- A recent update caused temporary software instability.
1. Turn Off Battery Optimization for System Apps
Xiaomi’s battery management is very aggressive, and it can stop system services from saving data in the background.
Disabling optimization for connectivity services allows your phone to remember Wi-Fi passwords properly.
Open Settings, and then tap Battery.
Tap App battery saver, and then set System apps to No restrictions.
2. Disable Wi-Fi Assistant Features
Wi-Fi assistant tools automatically switch networks to improve speed, but they can override saved credentials.
Turning these off prevents the phone from dropping and forgetting known networks.
Open Settings, and then tap Wi-Fi.
Tap Wi-Fi assistant, and then turn off network switching features.
3. Forget and Reconnect to the Network
If a saved network becomes corrupted, your phone may fail to store its password correctly.
Removing it and reconnecting forces the system to save fresh credentials.
Open Settings, and then tap Wi-Fi.
Tap the connected network, and then select Forget network.
Reconnect to the same Wi-Fi network, and enter the password again.
Lock the phone briefly to confirm the password stays saved.
4. Check Location Services for Wi-Fi
Xiaomi ties Wi-Fi stability to location accuracy for scanning and validation.
If location services are off, Wi-Fi credentials may not save reliably.
Open Settings, and then tap Location.
Tap Location services, and then enable Wi-Fi scanning.
5. Reset Network Settings
If nothing else works, the network configuration itself may be damaged.
Resetting network settings removes Wi-Fi, mobile data, and Bluetooth profiles, but keeps personal data intact.
Open Settings, and then tap Additional settings.
Tap Reset options, and then select Reset Wi-Fi, mobile networks, and Bluetooth.
Reconnect to your Wi-Fi network afterward and test if the password remains saved.
This step often resolves persistent connection issues.
6. Restart the Phone After Changes
Some system changes do not fully apply until the phone reboots.
Restarting ensures all connectivity services reload correctly.
Swipe down from the top of the screen to open Quick Settings.
Tap the Power icon, and then tap Restart.
Once your Xiaomi 15 Ultra restarts, connect to Wi-Fi one last time and confirm the password is remembered.
In most cases, the issue disappears once restrictions and network conflicts are cleared.
FAQs
Why does my Xiaomi 15 Ultra forget Wi-Fi passwords after restarting?
This usually happens when battery optimization or system restrictions prevent network services from saving data. Disabling these restrictions fixes the issue.
Will resetting network settings delete my files?
No. Resetting network settings only removes saved Wi-Fi networks, Bluetooth devices, and mobile data settings, not photos or apps.
Is this a software bug or a hardware problem?
Almost always software. Hardware Wi-Fi issues typically cause connection drops, not forgotten passwords.
