Is it safe to upgrade after unlocking and relocking?

[filex]

Earlier this year I had unlocked my iphone using ziphone for international travel. I relocked it back again using ziphone once I returned. Now my question is, if it safe to upgrade to 2.0?

I don't know much about bootloader or anything else. Ziphone said that it will restore in original factory settings. Does that mean it is safe to upgrade? Any inputs/suggestions will be greatly appreciated.

Thank you in advace.

 

[Rotara]

At the moment you should not upgrade your unlocked version 1.0 iPhone to the version 2.0 software. Some have done this and ended up with a locked handset.

 

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Does that mean even though I had my iphone relocked using ziphone months back, it is not safe to upgrade?

I am a bit confused.

Thanks