Forgotten Admin Password of auxilliary device (devices on HA)

Hi all, 

xg330 on HA

I had my HA mounted almost a year ago and I remember well that I wrote down the admin passwords for the primary and secondary device for my HA pair.
Today, I just wanted to access the secondary to check a few points, but I discovered that the password doesn't work!, it's a bit weird for me but that's how it is.
Is there a way to recover or reset the secondary password without obviously affecting the HA?

for information, each device has an IP address in the same subnet and I tried to access with the admin account.

thanks