1. check if your gateway is original, otherwise it'll brick your console
2. download pdf from gateway site
3. follow the pdf.
seriously though
turn off your console, remove sd card make backup with win32disk imager just in case. rest is easy just follow instructions.
and since it's your first time remember to backup nand and keep a copy of it in safe place.
edit: oh right you were talking about downgrading your console on beta.. well that might actually be a reason to worry.
2. download pdf from gateway site
3. follow the pdf.
seriously though
turn off your console, remove sd card make backup with win32disk imager just in case. rest is easy just follow instructions.
and since it's your first time remember to backup nand and keep a copy of it in safe place.
edit: oh right you were talking about downgrading your console on beta.. well that might actually be a reason to worry.