What does the instruction 'Fastair 345 recycle 1240' mean?

Question

Question ATPL - Airline Transport Pilot license - IFR Communications

QuizVDS · Accepted Answer

Fastair 345 is requested to reselect assigned mode and code 1240

QuizVDS · Answer

Fastair 345 is requested to set new code 1240

QuizVDS · Answer

RADAR instructs Fastair 345 to stop squawk 1240 immediately

QuizVDS · Answer

RADAR informs Fastair 345 that radar service is terminated at time 1240

Id 54 - ATPL - What does the instruction 'Fastair 345 recycle 1240' mean?