Register rental FortiGate 200G firewall

Hi,

For one of our customer, I have got the FortiGate 200G firewall as rented device as we are yet to receive our own new firewalls due to lead time. Meanwhile after changing the device password, firewall is asking for Forti care registration which I don't have as this been rental device, is there any way forward for this, I tried skipping the registration from bios but firewall does not boot further with error - Failed to boot the system.