After several days of study and many trials, finally works perfectly.
Here is the link for those who want to try.
78d367f346473b161632a8848757df1f ME371MG_all_WW_user_V3.2.2-2.raw Size 682062228
Currently there are no version 3.2.3 WW because no file to download from the asus website.
Upgrades coming to the tablet at the time and are generated specifically for your tablet and contain patches, no binaries.
File is the version 3.2.2 WW
Install from "droidboot" as any other firmware of asus
If you find my work useful remember to click the thanks button is free
Sorry for my cherokee English