Password will still work, if you have a doubt then re flash the firmware with clear data if the FP scanner still doesn't work then visit a service centre.

If you remember the phone's password then backup your phone data (everything except settings) flash the firmware with clear data, login through your Flyme id and then restore the data. You'll get everything back and the app password will be removed. And passwords are meant to be remembered not saved in notes.

You have to download the firmware from the forum for your specific and then click on it once you add it to the internal storage of your device. Then click on it and tick the box with the clear data which will appear when you click on the update.zip and then click update now.

You can easily download from any other browser. What device do you need it for?

Flyme 6 public beta http://dl-res.flymeos.com/Firmwa ... 019abacc/update.zip download and install with clear data