Flex Pendant frozen on "Connecting to Controller"

in IRC5
I am in the process of commissioning an ABB 4600 and the pendant screen is frozen on "Connecting to Robot Controller" when the robot is powered on. I have tried with different flex pendants but it still gets stuck on that.
Is there a way to do a hard reset on the controller without the flex pendant? Or is there a way to do an I-start to get into the boot menu with out the flex pendant?
Is there a way to do a hard reset on the controller without the flex pendant? Or is there a way to do an I-start to get into the boot menu with out the flex pendant?
Thank you!
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