Sorry to say but I cant find any firmware for this control board. Even my old links for zynq CPUs are no longer available.
Its Okay! No problem at all.
What exactly the current status of your miner? Why did you want it to upgrade it?
Its keeps restarting again and again once start. Sometimes shows quite high temperature and sometimes keeps the hash rate zero while everything connected okay. And sometime works good without any issue. So i think upgrading the firmware could fix the issue.
If its not working due to firmware issue your last hope is to replace the control board.
I am not sure whether its firmware issue or power supply issue as power supply is normal. Thanks.