It doen't matter version 061.121.226.12400 has a SPAR? Is it officially approved to update?
Could it possibly be the solution for my problem of long delays in scanning via Exchange 2010?
My first post was an appeal for a quite older version than 061.121.224.18803 that my MFU has now (061.121.222.06508, to be more precise, as I found out later yesterday it worked fine for some people who downgraded to this very version, but this solution was back 2015). I haven't tried nor SPAR, nor 06508 yet.
For now I'd just like to clarify what version of firmware can help to get rid of long delays.