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144C77 was showing as RA85563 today according to Radarbox and on its previous sighting it has shown as RFF5563 so looks like you are correct with the miscode which is well out. I note that on the flight yesterday its maximum altitude shown was 2525 ft and 220 knots
I also noted RA-3049G and got the translation as Hummingbird 33 so no idea what the type actually is, homebuilt possibly?? but it has been added to the database anyway
Thanks
Alan