[Q] How to keep ROM and recovery stock, but be rooted?

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http://forum.xda-developers.com – Hi, I have a P3113. I want to be able to receive the OTA updates from Samsung, but their OTA update process invokes a reboot into their stock recovery to complete the update. So, if I replace the stock recovery, the official OTA updates wont be able to complete. But the only way I have seen to "root" a stock ROM was to first replace the stock recovery with CWM recovery, which is need to install a Zip file that does the actual root. But, once I replace the stock recovery, I will no longer be able to do official OTA updates because they require a stock recovery. So, what (HowTos)