Question [Q] fails while updating using odin v1.85

hi geeks
i have galaxy s2
i put it in download mode and download update from a website
i try to install it on my mobile using odin v1.85 but it fails then
it remove the battery
a message show : firmware upgrade encountered an issue please select recovery mode in kies & try again
i put again it download mode but computer dosn't recognize it
download mode usb not recognized (port fails ....)

Help please ?
i 'm in a big trouble