[RUU-Question] Explain RUUs please

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http://forum.xda-developers.com – Hi, I've been looking at different RUUs since i've run an RUU specifically 1.29.711.11 n i know that 711 is the region and carrier specific number and 1.29 has somthing to do with the firware and software versions. How would i know what is additional on these RUUs and what is special about em and I found 2.xx.711 RUU as well and whether or not should i update it to that.. Another thing I found while reading posts is that the recovery added along with the 2.xx RUU isn't really favorable and that normally keep stock recovery while running the newer RUUs. How would you do that and what benefi (HowTos)