is there a way to downgrade my lumia 900 to 7.5 Tango? I'm not happy with 7.8 on it =/
You'll have to reset to factory, and then run updates through Zune, but stop before you get to the 7.8 update.
Are you sure a reset removes 7.8?
no it will not. 7.8 is the os not an update. Restore or reinstall.. A reset will only kill off your apps and settings for 7.8 not reset to 7.5.