Sprint's Android 2.1 update to be done via wire instead of OTA; wipe might be necessary

While the Motorola DROID's update to Android 2.1 was done OTA, requiring DROID users to do nothing more than to press a button after making sure the phone had enough juice in it, those who own the Samsung Moment and the HTC Hero on Sprint will apparently need to use a PC when it comes time to bring those devices into the rarefied world of Android 2.1. A wipe might be required as well. The reason why the pin-dropping network isn't sending the upgrades OTA is because of the size of the download which amounts to 80MB for the Moment and 117MB for the Hero  Now as an alternate plan, Sprint could use servers belonging to Google for the firmware update, but Sprint has yet to test them out and would not be able to meet the "required launch timeframe". A leaked Sprint document shows that the Samsung Moment was to get 2.1 yesterday while the HTC Hero would receive the upgrade in the first week of May, but we all know how accurate estimated upgrade dates have proven to be. The new software has been tested internally and should be ready to go. If you own either phone, check the Sprint support page for the Moment and Hero. When the time is ready to upgrade to Android 2.1, you will find all of your instructions on the Sprint pages.

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source: AndroidandMe