make sure you are using a program like jzip to remove the files.
winzip and winrar mess up the packing in the tar so you want be able to flash with it.
if you are wanting to do a nand backup before you go through with this you will need to flash the recovery to galaxo recovery 4.4 from drakaz.
do a nandroid backup
flash firmware
if you need to revert back you will need to put the custom recovery back on (as its overwritten by odin) and restore nandroid backup
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