just for reference, I am using platform 2.3.2.127, hardware is rev C-5. Login security had never been attempted until today. I enabled it, and immediately regret that decision.
This solution worked to let me back in, but something is still wrong.
I took extreme care when attempting to enable it again. It doesn't even let me enter new credentials, I have to type in my existing account name and password before it even lets me proceed, and then I am immediately locked out and unable to get in with the same user and password I literally just entered.
Something isn't working right. I unlocked it again via the link you provided above. Please try reproducing my steps, I followed the directions provided exactly a second time and resulted in a lockout.
Thank you for your feedback. I tried to reproduce and it worked as expected for me. Based on details provided above, I am not clear which part isn't working for you.