You can flash from ICS, stock unlocked or cwm repacked... Just make sure you are using Calkulins format all or modified format all to do wiping if you are doing any wiping.
Don't use the stock or cwm wipe data option to do any wiping, follow that rule and you'll be fine.
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This is true, but to save any headache, especially since he's new to the device, that's why I told him the safest route.
Also he's on GB, so he should be fine anyway. Just don't like taking chances with such expensive devices.
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