I'll take a shot with the assumption you have loaded either a custom rom or recovery and are looking to get a OTA (over the air) update from either your carrier or manufacturer. If that is the case, you would need to restore everything to factory in order to accept it. You wouldn't need to unroot the device, though you may want to use a root keeper app.
If you scroll down our homepage, you will see forums listed for each phone (at least the ones we have information on). In each of those forums is a sub section called [Device X] All Things Root (you will often see these called ATRs. Find the ATR for your phone, and in the threads stuck at the top will be an ATR Guide. This will contain any information we have collected about restoring your device to stock.
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