Hi friend.
Can you log in to your device? If you can, You can change your wifi password without resetting your device.
If you forget your wi-fi password or your wi-fi password is hidden. you can log in to the ONT web page to retrieve or change the password. Specifically, log in to the ONT web page (with reference to section How to login huawei EchoLife ONT). On the main menu, choose WLAN > 2.4G/5G Basic Network Settings. In WPA PreSharedKey , do not select Hide. You can also enter a new password and click Apply for the new password to take effect.

I hope I can help you!