Was CGK-DXB for 439 USD on Y Flex for today.

Interesting: I just booked this date (CGK-DXB / 24th Jan) as I had to chose one as on my planned return no J was available. I changed the booking a few days later (on around the 15th) to another date with a J fare.
Means: The upgrade offer mail was useless as I didn't even had the flight anymore in my itinerary.
Well, ...