Ah, thanks! Definitely helped, appreciate it!This I can help explain
Root means you have full admin access to the operating system running on your phone. This lets you read and write from the /system mount point, and do things like insert modules into the kernel (for the wifi tether app; and overclocking apps), install or remove system apps (bloatware); and install things like ClockWork recovery's Bootstrap because you can write to almost everything on the phone.
Now; bootloaders are different. They generally are ALL locked in some way, its just that some are encrypted and some are not. The OG droid had a locked bootloader, but it was NOT encrypted so the community was able to crack it open and replace the boot files.. so you got cool custom kernels and full AOSP roms.
The Droid 2 for example; has an encrypted bootloader; this is the real problem as the only way to get some rom's running (say Cyanogen) is for them to either use the 2nd init trick, or be able to replace the entire bootloader.
From what I gather, the kernel with gingerbread is much, much harder to exploit for 2nd init (right now I don't think anyone has successfully done it) and with the encrypted bootloader the D3 will be like the D2 unless we can get Motorola to un-encrypt it for us.
Hopefully my Kindergarten-level of understanding on this has helped some
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