Custom call sign

Hello everyone, I have a little problem with my call sign. Indeed before the last three updates I had the callsign called (FALKOM X) but recently I have it for an event but I can no longer put the old one afterwards.
So my question was: how do I put my old call sign back?

Hi there,
Any custom callsign created in app prior to 20.2 update is considered a grandfather callsign from that update onwards. If you have changed the callsign there isn’t a way to get it back unfortunately.

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What Chris said, no way to have totally custom callsigns now. You can still customise based on real world constraints.