This was achieved by sending a signal to the cash memory, in some cases with magnets, to manipulate the cash dispenser. You have to be very suspicious of anyone who claims to have a surefire winning system, because frankly, there are no such systems.
http://forum.spolokmedikovke.sk/viewtopic.php?f=25&t=789988&p=2756053#p2756053
https://mahayu.link/forum.php?mod=viewthread&tid=7392&extra=
https://talk.hyipinvest.net/threads/268160/
http://47.88.101.141/forum.php?mod=viewthread&tid=136400&extra=
http://horsecity.ru/phpBB3/viewtopic.php?f=18&t=156029
http://forum.bandingklub.cz/viewtopic.php?f=20&t=1098301
https://mmomakemoneyonline.net/threads/is-het-mogelijk-om-echt-geld-verdienen-met-gratis-draaien-crypto-doen.662807/
http://strada.bielsko.pl/1_lubelskie/forum/4-zadaj-pytanie/597480-mejor-poker-online-dinero-real-blackjack-con-dine#597480
https://gravatar.com/festivallucky04a8767d69
http://forum.bandingklub.cz/viewtopic.php?f=21&t=1336096