HI everyone, I was hoping you all could help me determine how many miles I would need to change (from C to F) my pre 11-16 avios award booking on CX. My wife and I are currently scheduled to go from North America to Bali (with a stop in hong kong each way). Unfortunately, we only had enough miles to book F one way and are booked in C on the other way. Now that we have more miles, we are hoping to upgrade the other leg to F, and were wondering if anyone on this board has experience with how many Avios it would take to make this change? Ideally we would be able to make the upgrade with 25k miles, i.e., the old reward chart. I would be grateful for any opinions or guidance anyone can offer!