rootfs.bin is the main.bin file you download from navifirm...

no no you are not flashing your phone but pretending to do so...once the battery level is at 9-10% you plug it out so that way no flash is done as for a flash to start 11% battery is the least that is required...the battery level will update every 1% so you can monitor it...

flasher -i will not be able to "kick-start" the kernel so the commands i gave u are the best option AFAIK...