if your have issues with the update not finishing 100% this will work
download the zip using heimdall flash like normal
ignore the rest of the files...
100% working gingerbread root using [ROM][CDMA/VZW][2.3.5]Stock+Root Vanilla by dsb9938
Here is stock update with no root from EC02 to EI04 just rename to update.zip and place on the root of your sdcard boot into recovery by holding volume up while powering on then choose install update.zip