ALL CREDITS BELONG TO botto00 over at xda-developer forums
I am merely compiling this on websites to provide ease of access to any Search-engine viewers.
botto00 has reverse-engineered Asus Fonepad .RAW format firmware files to include a root along with Superuser installed.
With the modified firmwares, the method to install is the same as any other Asus manual update from the website.
by Asus explains how to use Droidboot to update firmware files.
Currently modified releases are:
V3.2.3 for the WW SKU
V3.2.3 for the TW SKU
V3.2.2 for the JP SKU
V3.2.2 for the CN SKU
V3.2.3 for the CHT SKU
The firmware can be used to downgrade or upgrade without limits. A full wipe is not required, but may be recommended if you are experiencing issues.
The link to the download for the WW-SKU V3.2.3 Modified FW is located here.
The link to the download for the TW-SKU V3.2.3 Modified FW is located here.
File size 770768540
The link to the download for the JP-SKU V3.2.2 Modified FW is located here.
File size 689267591
The link to the download for the CN-SKU V3.2.2 Modified FW is located here.
File Size: 602883859
The link to the download for the CHT SKU V3.2.3 Modified FW is located here.
File size 779790396
If your Fonepad is from a different region, it will not let you install a non-corresponding firmware, currently there is no method for Fonepad's to change regions.
Original Thread at XDA Here
If you have the opportunity be sure to thank botto00, he is too humble to accept donations.