Hot answers tagged upgrade
Your fears are unfounded, although kudos to you for being so conscientious about the unique circumstances of your machine before attempting to upgrade. In any case, consider an iMac or Mac Pro which must have an external mouse, there is no internal pointing device. You'll be fine as far as a USB pointing device goes as long as the mouse you're using did not ...
Apple will replace the motherboard. The RAM is not desoldered and replaced, but the motherboard is simply swapped for one with the amount of RAM you want.
It's currently not availwble to downgrade an iPhone 4S. That would require a bootrom exploit, which has not been released yet.
I reccomend getting Homebrew. Then run brew install bash, it will install bash 4.3.33. It's the easiest and safest way. Then add the path to the executable to /etc/shells. For example: /usr/local/bin/bash
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