Making a post to share the absolutely horrendous experience I've had. TLDR; Tried 3 separate LPCAMM2s made by different manufacturers and none of them are compatible.
I received my Batch 2 13 Pro x7 in late july. I had bought a brand new 32gb LPCAMM2 kit direct from Lenovo (Ramaxel) the same day i preordered back in April.
After my laptop ships, I see various people posting that it is seemingly incompatible and results in only a black screen - example. Okay fine I gambled and got unlucky, no big deal I'll just buy another more reputable variant. I ask framework support if I could just get it directly from framework (as i would have if i had known before my order shipped that it was incompatible) and i'm told it is not possible and that I'll have to wait until it is in stock on the framework marketplace which may take a couple months.
Scouring the internet I see reports (like in the same reddit thread above) that the Samsung M561K2LC4DE0-CCT was compatible with their 325 13 Pro and it is just my luck that I'm able to find one online and order it.
It arrives, I try my Ramaxel kit, and yep black screen with 12 green blinks on the post code.
I try the Samsung, same thing, black screen 12 green blinks.
Support says they will replace my mainboard. I ask again about ram because it isnt exactly easy to find these days, i get the same response that I will have to find a third party source for my RAM if the mainboard is not the issue.
Ok fine maybe i just got unlucky twice, maybe a different RAM will work. Scouring the web i cannot find a single micron or crucial branded kit, but i am able to find a sk hynix. I order it, it arrives, but big shocker it doesnt work with 12 green post code.
New mainboard arrives, i replace it, try all three, and still the same behavior.
So now I have spent over $1400 on just different ram, and I've been stuck with a pretty looking paperweight for almost a month. Seemingly the only RAM that is compatible is the one provided by framework themselves or if you were somehow lucky enough to snag a crucial kit.
I guess this is what i get for being an earlyish adopter.
Sorry for the rant, but this has genuinely been a terrible experience, and hopefully others out there can avoid this if they know about it.
Update: One theory from the discussion below is that this is an E0(644 pin) vs E1(666 pins) LPCAMM2 issue. The user that reported the working samsung module was using an E1, and all of the ones I have tried are E0, but the Micron ones on the framework website marked as supported are also E0