Samsung Galaxy S2 in download mode breaks lsusb

Solution 1:

I've found my samsung intercept is very finicky about USB.
Try another cable? Try another port? Try rebooting? On some laptops it'll only work -sometimes-.

This isn't necessary an answer, but it's just too long to put as a comment. Please look into whether the following will work-

My suggestion is to avoid using Download mode altogether. USB is too finicky and it's not worth the risk. This is what I would do on the intercept. You should see if you can't find something like flashimg that will allow you to flash directly from the phone.

  1. Get temporary root. (use gingerbreak?) if you don't already have.
  2. Flash Clockwork recovery using flashimg.bin
  3. Flash update using clockwork recovery.