How do I reset the programmable buttons S1 and S2?

Press the Program button (Px) until the green light starts flashing, then press the desired button (S1 or S2) until the green light stops flashing. Finally, press the Program button again to turn off the green light completely. (Page 2)

From the official Geek Ps3000 4K Game Stick Lite Arcade Console manual, page 2

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