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Root access (typically) requires several components that work in concert with one another. A somewhat simplified view of what you need is: A native su binary. This can be invoked from the command line or from applications. It is what actually performs the act of switching users, and grants a process root permission. A "gatekeeper" application, that ...


You can either upgrade to L via TWRP itself (some reported having trouble with TWRP 2.8 and suggested trying 2.7) or revert from TWRP back to stock recovery if you want to go the OTA way (I guess that's what you're trying to do, you're not clear on that in your question). Also instead of TWRP you can try ClockworkMod recovery. edit: typo


I use the Nexus Root Toolkit for Windows by wugfresh, it will allow you to unroot and revert to stock with a button click. It also includes full instructions on any setup you need to do prior. You can find it here: http://www.wugfresh.com/nrt/. It will also allow you to choose TWRP or ClockworkMod if you wish and can help you install new ROMs too.


There is no fastboot mode on Samsung. You must use the ODIN mode, which is an alternative to fastboot. On Linux there is a client application called Heimdall which talks to phones via Odin mode. So the answer to your question is ODIN or Heimdall. ODIN is the proprietary Samsung PC application, Heimdall is multiplatform open source alternative. ...


As Ryan commented, you can use fastboot commands to push a recovery image to your phone. download a recovery image for your phone if you don't have one, then connect your phone to your pc and, via the fastboot tool on your computer, type fastboot flash recovery recovery.img where "recovery.img" is the absolute path of your custom recovery image (path is ...

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