...for someone that hates AI slop, you did a really good impersonation of AI summarization of my post that they were replying to...

There's no need to short pins or pop the BIOS battery on the Carbon. The BIOS Clear/reset button in the back performs the same function (shorting the pins) much more conveniently, so far as I understand it from the documentation.
AI Slop it is and I hate it , however, NO AI summarization of your post was necessary every word is mine and a well known fact I didn't even care to read through the litany you wrote just picked up glances here and there , that's for the other guy to read .
You are right, it does what you say with CMOS button until it doesn't and I'm talking out of experience, If you didn't do it then obviously you wouldn't know the difference , the explained option and method of hard reset bios is still available on board page 52 user manual JBAT1: Clear CMOS (Reset BIOS) Jumper

in case this doesn't help as a last resort and the switch keeps activated then his motherboard is a mythical POTATO like many others on this forum but that's more MSI's fault .
So i CMOS'd the thing, with the back button. i loaded defaults too, and still PCIe stuck at x8 like everything i tried before. didn't do the c-state thing tho. but iu tried all else you told me to try.
and i wrote that i noticed that my PC sometimes doesn't want to reboot, gotta correct that, since A95, every windows reboot button hit, gets the PC stuck, but not in mem training. the screen turns off, and i waited 5 minutes for any reaction and nothing. if the PC would be memory training, it would also get the screens out of standby, which doesn't happen. if the PC was off, hiting the power button would just boot the PC, but if i just press the power button, nothing happens, and i have to force shut off the PC on the front power button and then boot it out of stand by, with said button.
this didn't happen at all, before A95, same as the x8. and this booting issue is eerily similiar to the problems i had with my strix e-f 670 from ASUS, but that one was pretty sure, related to getting stuck in mem training, so this seems to also be a fully new and original problem too, cause with the ASUS, every reboot and every boot was a lottery, cause sometimes, it didn't happen. if i turn the carbon PC off now, it boots everytime. if i hit reboot, it gets stuck, every time.
so if it was just the x8, i would feel obligated to believe that it wouldnt have to be the BIOS, but the fact that this BIOS version doesn't let me reboot trough windows, makes me feel like this has to be something with the BIOS having not installed properly, as an odity was, the more new BIOS i installed, the longer the process of loading into M-flash, and loading the BIOS from an external stick took. i mean that shouldn't happen i think, and i really noticed this odity also, with the first pre AGESA versions for 1.3.0.0 taking longer and longer, now that i realized that mid writinng my diseration of failure.
maybe this BIOS/AGESA version has some special kinks, which could be something in my set up which this particular BIOS doesn't like?!
those problems only appeared with A95 aside from the long BIOS install times, and i don't believe that it has anything to do with the widespread AM5 PCIe coldboot, degradation issue. my mouse quirks are also related to me making many tiny operations in quick succession and not on boot.
so, to not have to downgrade the BIOS, i'm gonna hope that we'll see a new version till close to the end of the month, and if that doesn't happen, i will downgrade it before my PC wizard comes to visit me, to install my new noctua front fans cause the stock ones in my case are infuriatingly loud at 600RPM already. and we'll also install that new monitoring tool from der8auer, where you can see if the 12V cables are all having the right power ditribution, and also gives you a warning noise if all the juice goes over too few "cables" which seems to causes the melting 12V cables, so that i can force shutdown the PC if i ever hear the trumpets of jensen, and his barely thought out choice of a new power cable connection which is, having issues, to put i mildly.
but as the AM5 plattform has also proven to me, with issues i read from every board manufacturer, when i searched for a replacment for the strix. MSI according to most forums i scouered trough, had the least issues.
my PC wizards GF, also has reboot issues on ther ASROCK board, sometimes, and only one particular BIOS version didn't cause that issue for her. and as said in one of my ealier messages, the problems on my ASUS board, is something which atleast 5 other ppl also experienced in the ASUS forum. or in short, call me beta tester, cause if we ain't doing it, AMD certainly won't pay ppl to beta test for them XD
downgrading is like a last resort i'm gonna try, even when it's gonna irk me very very much, to not know, what's up. or maybe i'll have to reboot too often and then going to downgrade cause the problem is gonna infuriate me enough, to do it "for science".
on ASUS, downgrading as much as i remember, necesitated to have the stick in that one particular slot, and you had to flash from the back, flash button, and i take it this also goes for MSI in case of downgrading, and my cable managment had, it's world already rocked now, and when i have to get the PC out of its nieche anyway when my friend comes, then i can optimize the whole USB set up then with nothing in the way, and i'll downgrade the day before he comes so that i can just pull out the cables willy nilly, as i will survive one night where some things may not be connected for a few hours.
and as for me not mentioning dragons, atleast you can be sure that i'm not AI, cause my attempts at condensing information, as an author, sadly fall flat on their nose, cause i just can't keep myself from trying to be atleast, mildly entertaining for the reader.
i'm going to update you as soon as i'm gonna make a decision. for now, i'm just gonna mope that my 5k PC, still doesn't, just work XD
and obviously thank you both, even if it didn't net tangible fruits, but your explanations atleast made me a bit more knowledgable, which is always a good thing.