The modded bios has the name with slic in it, eg 721A1P16_ACER_SLIC_21.bin since u are using the batch file you will have to rename the modded bios file to 721A1P16.BIN for it to flash the modded file. What you have been doing is flashing the original unmodded bios.
nope - I drag out the mod bios from the WinRar file and rename it to whatever file name it says in the .bat file. This is how I have been flashing all three of them. It just refuses to update. grrr..