ok i just did the up date with mobile odin pro and after reboot i still have towel root working so that is a good thing now to see what is this performance up grade.oh when you do the up date you will need to run su to update binary again.
Put the .tar file SD card. or phone storage
Open Mobile Odin pro.
Scroll down to open file. Press it.
Chose the .tar file.
Checked Enable EverRoot and Inject Superuser.
I choose to wipe dalvik cache which is optional.
Clicked flash firmware and that's it!
you will also need to download the bootloader+modem tar and flash them with odin-3.09 from pc.link to tar are here make sure you use the G900T for t-mobile
Originally Posted by github
I got my towelroot on nice and tight, because I had a loose towelroot once and it fell of and crashed my phone.
This will be what the G900F international version got about two weeks ago. People report better performance, but it's all unverified claims like always around here. My guess is, and it's just a guess, that this will close the towelroot kernel exploit and get pushed as 'performance' so people update which is a good thing since technically it could be exploited for bad scary things!