How to reset supervisor password in DQ77MK?

Hi,

I'm having difficulties in reseting DQ77MK supervisor password.

I followed both approaches described here: I need to reset the AMT Password on an Intel Q or B Series Motherboard. How can I do this? - Stone Computers :: Knowledg…

After both, I got the "battery problem" message as expected. However, upon entering BIOS setup I am still asked for a password. Default "admin" is rejected.

Any ideas?

Thanks

Gin