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I have a rooted GSM Galaxy Nexus running CM 12.1.

Trying to boot into recovery gets stuck on the Google logo. The logo will appear while starting to boot, then the screen will briefly flash black, and then stay stuck indefinitely on the Google logo. Holding the power button powers the device down just fine.

However, if I re-flash CWM, it will boot just fine into recovery. Once. The next time I try, it will get stuck again.

Has anyone else experienced this? Is this a known issue with a possible solution?

  • Have you tried a different recovery like TWRP? Does the issue persist? – Firelord Aug 11 '15 at 16:32
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If I had to just guess from the discribed simptoms I'd say it's the kernal or hang-time during normal boot of loading the SD card.

The state you're discribing is known as a "soft brick" and "boot loop" among seasoned Android SuperUsers; try the quoted terms along with your device's name in a google search to find other users of your device model that have solved or worked around these issues. There are many forums dedicated to helping with spicific devices but I always go back to XDA-developers and thier forum's members to truble shoot my rooted Android devices. For many devices there's an online resource for flashing ROMs, Kernals and others that goes by the name of C.A.S.U.A.L. a perpious built scripting tool written by a developer I've watched for many years (in a totaly non creepy way) for hacking nearly every device I've owned. The author also provides tools such as jOden which easiy flashes Samsung devices with your PC's browser.


Additinal hint on searching with Google

  • Search a site site:somewebsite.domain

  • Search similar sites similar:somewebsite.domain

The above can be added to the end of your search quaries to nerrow down the results considerably.

Here's one link I pulled from using the above tricks mixed with your device's specs; http://forum.xda-developers.com/galaxy-nexus/development/gnex-toolkit-v11-1-0-drivers-backup-t1392310


You've stated that you can get back into CWM, this means you're not the owner of a "brick", so long as your device can be booted into either "Download Mode" or the "Recovery" screens you're device can be salvaged.

To re-flash your device with a PC you'll need to be in "Download Mode" and flash with a PC via USB, however, before trying these options you should first attempt to re-boot into "Custom Recovery" and restore from a known working backup. Often these bootloops can happen after messing with a "build.prop" setting or if you have moved an app over to SD that wasn't designed for it. The SD card takes a bit of time to load so if you've soft-linked a system asset from it, the asset could be loading during CWM booting process (ie loading the SD card to look for backups) and thus able to be loaded during the rest of the boot but otherwise called before loading the SD card.

** Download Mode is a differant button combo than CWM **

Best bet to keep from losing anything is make a backup now! or the next time you can boot into CWM. Even your non-working setup is usefull if you need to recover a text message or debug the differaces between working and non-working setups. Also it is really easy to do something dumb {I've been close} when frustrated, so give a gift to your future self, on the off chance that it is needed.

Then backup your SD card compleatly to another drive. Then;

  • reformat the SD card with Android's settings menu

  • re-download CM12 & copy back only needed data from the backup of SD card back to the SD card

reboot into CWM

  • flush the cache

  • flush the delvak cache

  • whipe userdata

  • then try re-flashing CM12

These are the steps I follow for the many Android devices I work with and similar steps are preformed for the even older devices. Ocasionally I will have to flash back to stock and re-root a device but this is rare; more often than not it is a bad kernal or bad download of a ROM that does this to my devices.

Oh and bootloops that don't let you get back into CWM without a cold start or PC flash is usually from TWRP to CWM backup/restor or flashing from one over the other in properly; similarly this sometimes happen when moving from stock to Super User; look up BML vs MTD for more info on that. But this is why most root methods have what is usually called "clean"-keral to flash just before going to CM or why when using Oden you have to un-check 'auto reboot' for certain operations. The stock recovery will attmept to overwrite your newer recovery.

Oh and before I forget here is the link to C.A.S.U.A.L. Google code page https://android-casual.googlecode.com/ The author has also made some really fantastic YouTube terdown & repair videos and has posted some really interesting articals.

  • I feel terrible after reading your excellent answer, but I can boot Android just fine. It's CWM Recovery that won't boot. I probably should have chosen my wording better. – mkaito Aug 12 '15 at 0:35
  • Are you moving from stock Rom to CM? If so then you're likely skipping a step in the flashing process. – S0AndS0 Aug 12 '15 at 6:45
  • Didn't know that carige returnes sent in these bubles :-: Link to jOden anouncement this'll let you flash most Samsung devices from your browser. The trick I found with my Samsung Epic : flash CWM and boot to it emediatly to CWM, then flash a modifide kernal (or ROM with kernal) that isn't stock, then flash SuperUser zip if neaded. If you have Root but are loosing CWM try ROM manager or ROM Toolbox to re-flash CWM. Loseing CWM should only happen when moving to CM from non-CM ROMs... mostly... – S0AndS0 Aug 12 '15 at 6:59
  • No, I've had CM installed for years. CWM just started acting up recently. – mkaito Aug 12 '15 at 11:42
  • Well in that case definatly try re-flashing CWM with ROM toolbox or ROM manager. Oh and don't use a Samsung USB cable for PC to Android flashing, I and others have much hate for the cables that come stock with Samsung, but HTC and BlackBerry USB cables are great. To be on the safe side you may also wish to try flashing using a differant SD card too; they can go bad without much warning and Androids running root are not always kind to them. – S0AndS0 Aug 12 '15 at 13:41

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