Nexus One 2.1-update1

Tired of waiting for Google to push the latest Nexus One firmware update OTA? It's probably worth the wait. Manually installing the update is somewhat of a pain that involves using the fastboot tool to unlock the Nexus One's bootloader, a procedure that's sanctioned by Google, but voids its warranty nonetheless. fastboot wipes the device's memory! Reboot the Nexus One into its BIOS-like bootloader by powering it off, and then holding down the trackball and power button so fastboot can find the connected device. Once the bootloader is unlocked, follow these instructions to update the Nexus One's firmware, a process that should leave the device's memory intact for those who already had an unlocked bootloader.