bamacken Ok, I've posted the md5sums for all the files under images.
My Filezilla had "treat files without extension as ASCII" option enabled by default (huh?) and that affected the kernel - bzImage, it was uploaded incorrectly, both for full and SPI images. Sorry for that.
I've re-uploaded both and double-verified all other files there. I'll post md5 sums for everything going forward to avoid anything like that.