I have a stock, unrooted Motorola Atrix 4G running Gingerbread 2.3.6. Due to an unexplained problem, I do not have significant access to the regular operation of the device, nor do I have USB access to use adb.
I do, however, have an SD card that can be accessed from Recovery to install update.zip files. I am now looking for a signed update.zip utility that backs up the contents of the partitions to the SD card (similar to this unanswered question). I have tried using this utility, and I have tried writing my own, but both fail to apply because of an authentication issue. (In contrast, attempting to reinstall the latest update from Motorola works just fine, insofar as it applies without authentication issues.)
So, is there a signed update.zip utility that backs up the contents of the partitions (in particular, the userdata) to the SD card without causing authentication issues? Could someone make one? Is there some official source (Motorola, AT&T, Google, etc.) that I could contact to get access to one?
Thanks very much in advance.