Does this bios have any Spectre/Meltdown Micocodes ? If so, then can you share an easy way to remove them ?

cpu506E3_plat36_ver000000BA_2017-04-09_PRD_EEB3BD5A
cpu506E8_plat22_ver00000034_2016-07-10_PRD_57D53E7A
cpu906E9_plat2A_ver0000005E_2017-04-06_PRD_59C0DF6C
cpu906EA_plat22_ver0000006E_2017-07-20_PRD_0C4FE9DD
cpu906EB_plat02_ver0000005E_2017-05-30_PRD_F417D795

Only corrected after 2018 mcodes, so no.

EDIT: Damm sir... is it really so hard for u using a search engine??? https://meltdownattack.com/

what exactly are those microcodes, and what will happen if i remove them all ?

They're updates for the CPU.

Generally they correct CPU errata and for Spectre and Meltdown include ways of handling or refusing certain code structures or specific instructions.

I suspect you heard Spectre and Meltdown uCode hampers CPU performance? You'd be right, but only in certain situations and uses, typically on server CPUs built on the same architectures. Which is precisely also where the vulnerabilities are more likely to be targeted.

So the actual choice you are asking about is fast and higher probability of executing code wrong or slightly less fast in 99.8% of end-user situations and maybe similar probability of being correct.

If you remove the microcode from the BIOS it probably makes no difference if they are old as the OS will patch them in anyway (to whatever level (MS if you run Windows) have determined is okay). Linux kernel also updates uCode but can actually be updated more independently of the OS, Windows you just kind of have to accept - or disable the OS files from loading, separate topic, easily researched.

If you remove the microcode from the BIOS you will get the factory shipped chip with all it's errata, even the corrected stuff prior to Spectre / Meltdown updates (that the OS doesn't correct for you, unless you disable it).