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Reminder that the EU explained this all perfectly for you Disney nuwars infants
>Jango Fett is using a secret Sith blaster technique taught to him by Darth Krul in the year 14BBY
>Jango learnt this technique after failing to capture a Jedi by the name of Planka Jinguash, a student of Frink Bungo the legendary dual saber wielder Jedi Master
>Darth Krul imbued Jango's blaster with ancient Sith magic as well as using a Sith Amulet in its construction
>the technique allows Jango to bypass a Jedi's ability to black blaster shots which lead to the killing of Jedi Master Coleman Trebor
>in order to maintain the efficacy of the Sith Magic, the baster would have to be periodically stripped and polished with Woodoo hide
>the Sith magic finally wore off at an inopportune moment in 22BBY when Mace Windu overcame Jango's technique and decapitated him on Geonosis