By default, both display "adjusted" on all Kuros (even ones whose service menu hasn't been tinkered with). Since the memory slots keep track of different statuses that change over time i.e pulse meter, I bet both memory slots are updated in unison as the pulse meter changes, hence the "updated" indicator.So it has to do with voltage changes also. I thought they had something to do with reset only. Had me a little confused since my kuro isn't reset.
Not sure why the indicator for dig eep goes to "no data" during the "safe reset" process. Perhaps its data gets deleted and the current settings / statuses are stored in some type of RAM. Then, when you make a decision as to whether to keep the reset or revert, it either copies the current data from RAM to dig eep and backup (keep reset) or copies the data from backup to dig eep (revert).