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Old November 16th, 2012, 04:45 AM   #1 (permalink)
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Default Nexus fastboot oem unlock bootloop


The following problem actually occurred on my N10 yesterday, but I'm posting here because I've seen a couple of similar issues with people's N7s a few months ago and I thought that that experience might be relevant as they're both Nexus devices. The threads on that never actually seemed to reach a resolution...

I've unlocked and rooted several devices, so I'd say I pretty much know what I'm doing. I plugged in and ran fastboot oem unlock, I clicked ok on the tab, which returned a message in the cmd prompt as successful.

Rebooted, but after the Google screen (with unlocked padlock) the tablet never loaded past the flashing X boot screen. I know it can take a while on the first boot so I left it for over an hour, and when it still didn't work I tried rebooting several times.

I then went back to bootloader and tried a couple of things, first relocking and then unlocking the bootloader, then I did fastboot erase cache and tried again - still no dice. So erased everything in fastboot and flashed the factory images downloaded from Google (MD5 checked out). The cmd prompt said that everything had flashed successfully and no errors.

But I still had the same issue - never booted past the flashing 'X' screen. It didn't really bootloop, as it didn't crash back to the Google screen ever, unless I held down the power button to turn it off, just got the spinning X for ages and ages.

Eventually I got it working by going into the stock recovery and performing a factory reset from there. It then booted normally - although the bootloader is still locked, I haven't tried fastboot oem unlock again and don't think I will until they are back in stock in case I need to RMA it!

Did I just get unlucky? As I said, I've never had this issue before with unlocking any other device, but I'm wary of doing it again in case there is anything wrong. I'm reasonably familiar with what I'm doing, and tried everything I could think of - sorry for the long post, but I'd like to know if anyone can spot something I overlooked!

My real question is this: what does performing a factory reset from the stock recovery do that wiping system, cache, bootloader, recovery, and userdata and installing the factory image via fastboot doesn't! Is this a problem that's likely to repeat itself, or was I just very unlucky!

Thanks for any advice.

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