updated 12:20 pm EDT, Sun April 15, 2012
Some Nokia Lumia phones slip with pre-Nokia boot
Nokia has inadvertently let some owners of the Lumia 710 and Lumia 800 get full control over their phones. A discovery by XDA-Developers member biktor_gj has found that some phones ship with Qualcomm's stock bootloader, not the Nokia-customized version, and can load any custom firmware. Accordingly, he had already posted an interop unlock that lets owners load virtually any app, not just those cleared through the Windows Phone Marketplace.
The hacks as always carry risks of rendering the phone inoperable if something goes wrong. They don't constitute full unlocks, the contributor adds. Newer production runs of the Lumia phones, likely including any Lumia 900, are also much less likely to have the stock Qualcomm firmware, leaving some owners without the option.
Interop unlocks aren't new, having been performed on phones like the LG Optimus 7 before, but are relatively uncommon. Attempts to unlock or work around regular bootloaders have so far proven largely unsuccessful. [via Windows Phone Hacker]