VKB-SIM

hi
new in the sim community
just buy a used 2 gladiators NXT
connect them did FW update to 2.122
they sims to work but the problem I have is both of them
have blue and red led that flashes in the base of the joystick..the top oval led in the face is solid blue
what is it mean?
thank you

That means they need calibration, follow the process from here.