During these updates, it should have shown a path to those but I assume those are in the $Windows.~BT folder somewhere. You may have a memory.dmp in the Windows folder or a minidump file in the Windows\Minidump folder.
What is your current status, are you back on the prior build after a rollback?
I am going through every line looking for something. I see where is says it is rolling back but have found no indication as to why.
If you want to try changing the reagentc settings, it isn't hard, I just would not want to do that if that recovery partition was not the original one.