downgrading:
click here
if you downgrade here is another installation guide:
click here
my advice, if you downgrade, before downgrading install emuNAND and use emuNAND tools and extract your emuNAND
click here
downgrade (pretty sure this formats SD, I can't remember)
(EDIT: this is where emuNAND tools comes into play, you can inject your emunand back onto your SD and stay at 9.2 on emunand and keep your sysNAND at 4.x)
do not update emuNAND as currently gateway cannot play the latest firmware
if you do not want to use the browser exploit every time you launch emuNAND then downgrading is your best option and follow what I posted two links above
the downgrade guide should have you fully hooked if you choose to downgrade and it will answer a lot of questions you may have)
EDIT: downgrading is not essential and is completely optional