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BIOS Setting for PCIe EP device Enumeration

I have dell optiplex 5050 with BIOS Version (1.5.2) & a custom PCIe EP (Endpoint) device. Now, this PCIe EP device gets failed to enumerate often.(Only 3 out of 10 gets this device enumerated)

But when I am in BIOS-Setup for around(20 secs) & then exit from there-- then that device is enumerated always.(I read from this link:  Xilinx-Forum that exiting from BIOS-Setup does complete enumeration .

Is there any BIOS Setting that can help achieve this functionality without going to BIOS first? It would be better if I can achieve this without updating BIOS version.Thanks a lot for the help.

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