[Q] Note 4 Full Disk Encryption Wrong Password - Galaxy Note 4 Q&A, Help & Troubleshooting

Hello,
I have a Note 4 ATT and I had a full disk encryption from the day I bought it. I'm using it for about 2 month. Same password from beginning.
Now I rebooted my phone and when I want to enter the password, it says it's wrong password. I'm 100% sure it's right password. What's wrong with it?
It was the same password for screen lock, so during this 2 month I entered the password thousands of time.
I have extremely critical information on my phone and I can't just factory reset it. Any thoughts? Did it happen before to anyone else? Any thoughts?

since this is pre OS boot you cant do anything. mine has the same and it works fine. first asks for password then screen lock password then decrypts.
are you sure your password is the same as screen lock password ? its unlikely as decryption passwords are normally complex 8 character+ passwords.

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*Detection* said:
After too many failed fingerprint attempts, it will only ask for the password
Maybe someone else has been trying to access your phone
Factory reset to regain access if you don't know your alternative password (Probably a good idea to write that down)
Click to expand...
Click to collapse
Yes, you are correct. I tested this again, and I think that, in the morning, I really used wrong password . And the first time I didn't notice the displayed info, about password already being set, on Android Device Manager site, when I tried to change the password.
Thanks for the replay

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