Don't give up bud. The S4R is a great bike and worth the effort.
My prior post may sound too complex and expensive but it's not. The IAWDiag software is free, the cables may end up costing you $30 - $40 and if you don't have laptop computer I'm sure you can borrow one. The S4R map is also free and it's very simple to flash the ECU.
Hook up the cables,
switch ignition on,
start the software and wait till it connects to the ECU,
select find the file on the laptop,
and then just press GO. It will do everything by itself.
There is also an Android software called TuneECU that you can pull the codes from the ECU with;
TuneECU
Here are cables for both IAWDiag (JPDiag is the same) and TuneECU Bluetooth from Lonelec in UK;
IAWDiag - JPDiag - GuzziDiag Cables
TuneECU Bluetooth Kit for Android Don't worry it's for all Ducatis not only Multistrada.
There are also links to the respective websites. So don't give up. Get motivated. Let me know if you need anything else.