marshmallow update for Galaxy S4 (SPH-L720)?
Is verified marshmallow update for S4 (SPH-L720) available on the internet?
Is this a good question?
No. Unfortunately there are no Official Samsung Firmware released for the SPH-L720 above 5.0.1 which is Lollipop.
You will have to resort to a custom ROM / AOSP rom which is done via rooting your phone, flashing a custom recovery like ClockWorkMod (CWM) or TeamWinRecoveryProject (TWRP) then downloading the ROM firmware and the extra files like Google Apps (GAPPs) to install base google applications along with the custom ROM (usually for play store).
Update: You posted a comment but it looks like it got deleted again.
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