Help update has major issues

[Boo Boo]

They did something to the wifi, signal is weaker. And when the battery drains down , and you plug it in to charge it jumps up to 99 percent within a minute.

How does one get rid of this update

 

[BlackGravity]

my update made my tab run better.. no issues at all.. i would think you would just flash the older firmware like you would any rom.

here's a link to stock firm's.. older ones...

http://rootzwiki.com/topic/24484-stock-firmware-images-and-updates/

 

[Boo Boo]

can I roll it back with out having my device rooted? therd are no instructions with that linkl