I just rescued a friend’s Nokia E61 which was not booting anymore. There was no way to flash the phone with the Nokia Updater since it wouldn’t boot and the Nokia Updater needs a working E61. A Nokia Repair center also told us they couldn’t do anything for us and that they would have to send the unit in to Nokia for repair.
Well, I happened to stumble across a site on the net which would describe how to reset a Nokia 6600 which is running an old version of the series 60 OS. It was using both *#7370# (hard reset) and *#7380# (soft reset) for resetting a working unit but further more it also showed, that you could format the unit by pushing the “green phone key”, 3 and * together while powering on the unit. Since the E61 powers up immediately when you insert the battery you will have to push those three keys before you insert the battery. As soon the battery is inserted to Nokia logo will show up for a while. You must hold the buttons until the pin code entry comes up. While you hold the keys the unit will reformat its flash memory and revert to a factory default state.
By doing this I was able to recover an apparently broken unit without having to send it in to Nokia for repair. I thought I’d share this as it might come in handy for someone else. Let me know if this worked for you too!
BTW: I think this works with other models like the E50, E60, E70, N-Series and others too.