[Q] Upgrading software in rooted phone

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http://forum.xda-developers.com – HI, I'm using v10H on my optimus l9 (p760) atm but I saw there are JB (v20) already on forums. I tried to update but it always stuck on 15% telling me that phone is not connected. So i thinking about software update but it telling me, that new update is ready to download. I'm using v10h and it says that v10c is ready. What if I upgrade to 10c? can it brick phone or something? (HowTos)