Windows Phone 7 Thwarts Jailbreakers
The yet-unknown number of people who’ve bought a Windows Phone 7 device this fall probably didn’t know of a hidden feature on their devices: jailbreak rollback.
The jailbreak rollback reverts a jailbroken WP7 back to its locked state. It was observed by the makers of ChevronWP7, the first known jailbreak application for WP7, during discussions with Microsoft earlier this month.
As creators Rafael Rivera, Chris Walsh, and Long Zheng wrote in a blog post:
“Contrary to circulating reports, Windows Phone 7 devices unlocked via ChevronWP7 are not being targeted by Microsoft. Instead, the phone is reverting back as a result of a periodic check. Simply put, the phone rings Microsoft and asks ‘Hey, am I supposed to be unlocked?’ If Microsoft responds with a ‘No, what are you thinking?’, the phone apologizes and initiates a lock down.”
“Unfortunately, while in this state, an unsigned application launch results in a misleading (and scary sounding) error message: “[application name] has been revoked by Microsoft. Please uninstall it.”
Launched in November, ChevronWP7 lets users side-load applications onto their phones without having to go through the Windows Phone 7 Marketplace.
On December 1, however, after “good faith” discussions with a Microsoft executive, the makers of ChevronWP7 agreed to discontinue the tool in order to show its support for Microsoft facilitating homebrew development.
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