need help for oem slp activation

hi all
i almost read all guides here
i want to activate my windows 7 pro sp1 which installed as uefi with gpt
i didnt try cody's ms tk yet because i want to try activating via oem slp first

i red sticky post for vista activation here
and other sources from internet like: activating windows oem way

so
i got a asus x550k laptop which was a freedos
i guess it have slic table 2.1
i am not a pro so i barely know about slic
but i know its related with bios which i dont want to irritate too much

here is my confusions

q1: does using oem slp method manipulate my bios?
q1.1: is it kind of injecting smth or it is safe?
q1.2: is using slic_toolkit a risky thing if i really need to know my bios has a proper slic table for method?
q1.3: does it do a permanent effect to my bios?

q2: where can i find correct cert. file?
q2.1: i downloaded some files from internet. are they ok? or can anyone give me a link for it?

q3: does it matter which brand cert. selected (afaik product keys doesnt matter). do i need to use a asus cert.?

q4: i tried my old laptop's oa key to activate via telephone which failed. does this differ for process for this method.

tnx in advance

 

first of all ty for fast replies
@Tito
i ll try to make my questions clear

my laptop is a asus X550JK-XO012D

q1 and 1.1: oem slp method changes things in my bios. right? as u mention modding it. is it possible to leave my bios virgin ?
related with q4 : i wonder if this modding effects my bios permanently? ie enabling slic forever is a irrevocable action?

@urie afaik daz loader doesnt work with uefi. so your recommeded way (ie windslic) is a risky thing?

1 more question: does daz loader or cody's ms tk does exatly same things what this method do automaticly.

and i dont want to turn to normal mbr bios mode (some guides offers it for activation :/)

lastly a laptop activated via oem slp got a geninue pass when it upgrades to win 10.
my final goal is to upgrade a geniune win 10
(my other laptop activated via extreme loader, but when upgraded to win 10 it got a generic win 10 key)

 

tito, sorry i m bothering u so much

i want to ask another thing related to your last reply.
(btw i checked my bios via rw everything and didnt see a slic tab )

i recently upgraded my x550jk to win 10 pro from win 7 sp1 which was activated also with extreme loader. but it has a generic key which i didnt want . because of MS threats pirated versions can not use win 10 any more.

and yesterday i bought a ssd
whole story starts with this

i installed win 7 home basic uefi (because i thought i can use my old laptop's oem product key to activate new laptop)
but it didnt activated it via phone and i didnt try to activate it online yet (probably it wont work too)

i aimed to upgrade win 10 with a genuine OS.
but it seems i wont able to do that

so
if i install a clean win 10 pro uefi
will it be activated again and automaticly because of i activated it once with my old hdd?