Thanks. Please see inline.
Did you already manage to update your board? -> No
Before you load your passthrough sketch.
Can you remove or comment this line on the top of the sketch #define R4XX. -> OK, no change still doesn't work
Can you check that your IDE still has the correct board selected to compile for? -> SODAQ SARA ON COM5
After installing the UEUpdater, did you reboot your pc? > Yes
Did you start the tool as administrator? -> Can't run as administrator (even when trying to change permissions via the Properties, Run as Administrator is greyed out).