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Whenever I follow a root guide, I see a link to super su and twrp files. Is this super su and twrp file the same file for all phones or is there a different super su for each phone? Also, if it exists for each phone, is it rom specific? Do I need a seperate super su file for cm 13 and stock rom on the same phone?

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SuperSU is generic, same for all (most) devices, some specific devices or methods may require a specific version though.

TWRP is very device specific, each build is customized for the intended device. http://twrp.me is the official site for TWRP which has a database searchable by device.

CM13 is pre-rooted, you do not need SuperSU at all.

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    Upvoted for mentioning that one doesn't need SuperSU on CM. – Death Mask Salesman Nov 10 '16 at 12:07
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    Though it's said that replacing the internal supersu by a "native one" is said to bring more stability and better performance :) But that might be either subjective, device-specific or both. Fact is, it's not necessarily needed. – Izzy Nov 10 '16 at 13:33
  • @Izzy Guess I've never seen instability in the native superuser of CM based roms, as far as performance goes I'm not sure why one would be faster than the other, a couple milliseconds difference shouldn't be visible to the user, but fine grain configurability could be a factor. – acejavelin Nov 15 '16 at 20:22
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    @acejavelin the one built into CM is not "native" as far as I've heard, but rather "Java", while the other one is binary. But I've not busied myself much with that: if the one present works for you, and you have no issues with it, no reason to switch. – Izzy Nov 15 '16 at 21:30
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    @acejavelin especially with the permission castration on MM, I don't want to use a device running Android 6+ without root and XPosed. One of the reasons I'm still on LP. But we're drifting off :) – Izzy Nov 15 '16 at 22:11

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