I can't update my Samsung SII to the latest firmware As soon as I connect my Galaxy S2 with my computer it detects and Kies tell me that I have an updated version available. So I press update it downloads, prepare everything, then my phone goes to "Downloading do not turn off the target" and then Kies doesn't identify my phone. I've done it so many times before, every time I had an update from Samsung I've updated the same way. 

I have tried different versions (1.5.49.0, 1.5.51.0, 1.5.53.0) of "Samsung USB driver for mobile phones" but nothing resolves the problem. I have tried to reset my phone to default but that didn't resolve the problem as well. As soon as it goes to "Downloading do not turn off the target" then the same thing happens. I don't know what to do, any help would be highly appreciated. BTW, my android version is 4.0.4 and baseband version I9100BVLPE if that helps.
Try installing Kies and updating the OS on another computer. 
It is possible that you have the wrong drivers installed on the computer and as far as I know this cannot be undone.