are you sure about this ? i had a doubt about instaling win7 on pure UEFI as it doesn't work on my machine, i can install win7 on UEFI only if i enable both legacy and UEFI on my machine otherwise it doesn't work but i want to believe that there is a way to be able to install win7 on pure UEFI. are you saying that nobody was able to do that until now ? otherwise could you please be more explicit about this "Depending the on the architecture, changing the OSID in DSDT may yield nothing", what do you mean by "OSID and DSDT" ?
you are beginning to know me, lol, i just want him to confirm the fact that nobody managed to install win7 on pure UEFI until now.
From looking at the bios photos it looks like a Clevo notebook. Since it also shows Intel ME version 0.0.0 I'd say someone stuffed up flashing it (or it's an early sample). With Clevo they don't post bios/uefi files on the official page which makes it hard but there are some forums & a "mirror" site that offer these. If you can't find the correct updated uefi then I'd just stick to a Win10 install...
Search for generation 2 they make custom windows 7 uefi iso's, I've used them for threadripper without csm and they've worked perfectly for me in uefi.
@Tito Firmware dump... do you mean RW Everything report? If so, take a look at XSDT.zip file here: https://forums.mydigitallife.net/threads/award-ami-bios-mod-requests.5863/page-3027#post-1410921. If not, what tool do I use?
DSDT describes devices to the ACPi .. in it the OS id operating system id with specific if Linux or if Windows for ACPi. the only reason i mentioned Clover was for the graphics CSM module.. but i dont think it could help.