I just upgraded a pair of 433s..

Lost the ability to login to them via WinBox..
Password from serial port is fine, but via Winbox = "wrong username or password"...
Checked and unchecked the secure option...

Don't see the solution..

What am I missing ??

Same thing happened to me. I'm guessing we're outta luck and have to reset the device.

However, I have no one to blame but myself for not having a backup file.

Change that - found the solution in a different part of the forum: you need Winbox 3.14

https://www.mikrotik.com/download/share/winbox.exe

In order to access router running this version by Winbox, please download v3.14rc Winbox loader from here:
https://www.mikrotik.com/download/share/winbox.exe

Hi,tried with winbox v3.14rc1 but still wrong username and password message.
Any other way?
I have broken reset button,so no way for reset it to me.
I have RB951G-2HND,does it have Jumper hole reset?