Flashing Rom Lumia 720
I am new to this forum. I am also new to flashing ROMs. I have recently installed Amber Update which made my Camera Quality terrible. I heard about flashing rom but never do that. One guy from another forum sent me link and tutorial how to downgrade my phone to GDR1. My questions are:
1. Do I lose warranty when I flash my phone?
2. Is it dangerous? Phone can stop working ?
3. Is it reversible? Can I hard reset to original ROM ?
4. Is it possible that ROM is virus and if yes, then how to check it?
5. This guy sent me a link to ROM with Variant Name : RM-885 VAR PL PTK CENTERTEL WHITE. How to know if its GDR1, is it working ? Is there any database with "checked and working" ROMs?
Sorry if some of the question are very simple but I am new and can't google it.
EDIT: please moderator move my topic here : http://forum.xda-developers.com/windows-phone-8/help
, it is wrong place, sorry.