Platform Development, Hacking, and Modification
The Nexus One ships with an unlockable bootloader allowing developers to participate in the Android Open Source Project in addition to developing applications. The Nexus One operating system can be unlocked and flashed with the fastboot utility which is part of the Android Open Source Project. Fastboot runs on Linux, Mac OS, or Windows and accesses the Nexus One through the USB port.
The bootloader of the Nexus One is accessed by holding the trackball while powering up the device.
Users are able to gain root privileges on the device by unlocking its bootloader using the fastboot command "fastboot oem unlock." or by uploading specially crafted data packages via the Android debug bridge without the need to unlock the bootloader. Unlocking the bootloader or rooting the device allows the user to install non-official firmware images. Additionally, obtaining root privileges enables a user to override protected operating system features, and install arbitrary software. If using the fastboot command to unlock the bootloader to gain root through use of a custom firmware image, the user is presented with a Google-created screen stating that unlocking the bootloader will void the warranty as well as void any insurance plan. The popular CyanogenMod build of Android has already been released for the device.
Hidden menus can be accessed by dialling the following numbers:
| *#*#info#*#* or *#*#4636#*#* | "Testing" menu on the Nexus One and most other Android devices. It will bring up 4 categories: Phone Information, Battery Information, Battery History, and Usage Statistics. Also allows for disabling of the phone's cellular radio. |
| *#*#checkin#*#* or *#*#2432546#*#* | Force an immediate search for patches and updates. |
| *#*#talk#*#* or *#*#8255#*#* | GTalkService info |
| 245# | Load Contacts from SIM card |
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