Beror på hur den är låst.
Hittade detta på xda-developers
http://forum.xda-developers.com/showthread.php?t=959456&page=2
Right this has been rife on the Atrix forums, so let's spread a little knowledge before this gets out of hand too... (If I get anything wrong feel free to correct me, but I understand it as follows):
Rooting - Root access does not allow you to install custom ROMs or kernels. What it does do is grant you access to previously restricted partitions and functions, which allows us to remove apps from the /system (like carrier bloatware) or access functions such as tethering if they are not available.
Locked Bootloader - Every Android phone has a locked bootloader when it is sold, even the Nexus One and the Nexus S. How easy it is to unlock is what differs between them. Once a bootloader is unlocked, custom kernels can be loaded.
Signed Bootloader - This is a tricky one to crack, but not as difficult as an encrypted bootloader. A signed bootloader requires the files on the booting partition to be signed with a private key, otherwise it will not load them. It may or may not be possible to break past this process, it changes from device to device. This is by no means easy, and by no means 'certain to crack, it's just a case of when', so don't see this as a good sign.
Encrypted Bootloader - Pretty much impossible to break, the Milestone and Droid X guys have been trying for months and months, and have yet found a way round it. This involves the eFuse technology you may have read about in the news.
In short, root access doesn't mean custom ROM's, but a locked / signed / encrypted bootloader doesn't stop the possibility of custom ROM's either. It stops custom kernels, which causes 3 main issues if what ever method of
locking is used cannot be broken:
1.You are limited to the released or leaked offical kernals for that device, so any bugs present there will always be present
2.A lot of speed increases / battery life improvements (including under and over clocking) are kernel based, so they won't be possible
3.You will be limited to a kernel version, which may prevent future version of Android working on the device
At present, it is not known what the SGSII will have, or how easy / hard it will be to root and get into the bootloader, but at least now you'll know what each stage will allow, and won't going running into the 'We have root' thread saying 'OMG we haz haxorz the fone, custom ROMz here we come !!!1!!!one!"
EDIT: I get the impression you can underclock the processor simply with root access, you don't need a custom kernel.
Stämmer nog inte riktigt att alla är låsta.
SGS och SGT har vist helt olåst bootloader
Tyvärr verkar det som trenden hos HTC är att ha signerad bootloader 
http://www.talkandroid.com/34418-htc-locks-incredible-s-bootloader-no-custom-roms/
Edit
Hittade detta på prisjakt
Hmmm, so the bootloader is open but the root exploits are closed making it impossible to dump boot / recovery. Oh well, I like a challenge!
Från Paul O'brien..
Kanske finns hopp då ?
Last edited: 13 april 2011
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