With so much disappointment AND anger at HP, what can I do now to upgrade my Z620 after i loaded it with 192GiG of System RAM and was about to get the highest possible Xeon V2 processros to do my projects, i found that my BIOS v3.88 has the crappy boot block dated as 12/28/2011??
It seems even being able to look for an updated motherboard is NOT easy as some people here bought one thinking that it is has the correct part number but yet it was not!!
Doing the flash programing appearently needs tools and knowledge which i'm not ready to waste my time on! 
Is there any step by step guide to do that flash programing on the z620?
Aaaah HP, how i hate you by now!
And thanks for everyone here EXCEPT the HP person who decided to block my BIOS from running the CPU V2 and didn't mention anything about it in the user guide or system spec or any system brouchers thrown around that made me buy his piece of crap workstation, he really does NOT deserve any thanks AT ALL!! 
Update: I just found this document:
http://www.sommerli.ch/partnerinfo/images/20140106/Processor_and_Memory_FAQ%202013.pdf
It says:
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HP Z420, Z620, and Z820 based on the Intel® Xeon® E5-1600 v2 and E5-2600 v2 processors have no other changes except the CPU and BIOS boot block. All other circuits are identical to the Intel® Xeon® E5-1600 and E5-2600 processor boards we are now shipping. There are no other chipset revisions. The Z820 Workstations already transitioned to the D1 stepping of the LSI 2308 SAS controller prior to this processor transition, and new boards ship with this new stepping. This is the only change since these platforms were released.
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Which made me feel even worse! Update your crap BIOS then if there is not hardware changes!!!
ah this is too much for my heart to handle!!!!