If you love to hack and mod your device then you know how important it is to have a safety net. All it takes is one bad flash or one tiny mistake to send your phone into a bootloop. Without an SBF or a way of restoring your device a simple softbrick can turn your device into a paperweight. If you had updated to .629 then you probably found out that you are no longer able to revert to an earlier build via flashing an sbf. The good news is that while you may not be able to downgrade you will be able to unbrick your device via the official .629 SBF file that has been made available. This version is also rootable!
Grab the Official D2G .629 SBF via Rootzwiki