Source: Android Developers
While this is an unwelcome roadblock, there’s a way to work around the issue. Instead of side-loading OTA images, Google recommends that developers interested in testing Android 15 DP1 opt to flash a factory image to their chosen devices. It bears repeating that this build is not meant for regular daily driver use, but rather for app developers to test their apps on.Currently, there’s no indication from Google about when the issue will be resolved and downloads will resume. This news primarily impacts developers, as this is an early build, and probably not even that much since developers would probably end up flashing their devices anyway.