I've gone back to 8.90.4 too, it's a pretty solid build for me. Adamg mentioned that downgrading is not possible due to the new partitions so it might be essential to do a fresh install, and if you're installed to internal it may well break everything but I've uploaded it to dropbox anyway Dropbox - LibreELEC-S905.arm-8.90.4.img.gz (use at your own risk, etc. etc.)
You're amazing, thank you so much for the mirror. 8.90.4 was working pretty perfectly for me also, so I'm happy to just stay there.