12-02-2016 05:37 AM
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tools
  1. amadhatter's Avatar
    I'm having trouble unlocking the bootloader now. When I do the "fastboot oem unlock," command, the screen pops up, but when I press yes, it says unlocking now, stays at that screen, and on the cmd window, it says:
    <bootloader> unlocking...
    FAILED <remote: <unknown error code>>

    With the bootloader locked, I can't do anything. Any solutions?

    This is in the bottom left corner:
    FASTBOOT MODE
    PRODUCT NAME - grouper
    VARIANT- grouper
    MW VERSION - ER3
    BOOTLOADER VERSION - 4.23
    BASEBAND VERSION - N/A
    SERIAL NUMBER - 015d25689a50001d
    SIGNING - not defined yet
    LOCK STATE - LOCKED
    I am having the same problem. It has been trying to unlock for the last 30 minutes. Any help appreciated. I have a feeling it is knackered if I can't unlock it. When I start up the tablet I get the Google logo in the middle of the screen and the bootloader green Start button in the top left hand corner. I can move from the Start button to the Power Off to Recovery Mode and Restart Bootloader with the volume buttons but never get past this screen.There is no lock at the bottom of the screen.
    05-03-2014 07:27 PM
  2. Julian Melling's Avatar
    Help!!! Hi, I'm a bit of a newbie and am looking for some support on a Nexus 7 2012. I did the OTA for 4.4 and then started having the boot loop issues. I followed the online guide etc to re-flashing, and upgraded to 4.4.2 (using the dodgy 4.23 bootloader image from google, now used the better version). Everything was fine for a few weeks, I then started to have reboot problems again (it usually happened with the Independent Newspaper app).

    I then tried to reflash using Rootkit, Android Toolkit, manually using SDK etc to no avail.

    Currently the problems are (device boots and is unlocked):
    - Cannot delete apps
    - Cannot factory reset using any method
    - Reflash, go through all the steps - makes no difference
    - Cannot relock

    It is as if a previous reflash was written to a partition, and the new flashes I'm doing are going to another partition that is not booted (at this point I don't know what I'm talking about).

    I've tried using different USB etc.

    Any ideas out there??

    Thanks, Julian
    05-29-2014 10:11 AM
  3. Jona1969's Avatar
    Please help.

    I am stuck trying to install factory images back on my Nexus 7 (2013 wifi)

    the message I am getting is:

    E:Can't mount /cache/recovery/last_install
    E: failed to open last_install: Invalid argument
    Finding update package...
    Opening update package...
    E:Cant open /tmp/update.zip
    (bad)
    Installation aborted

    I'm trying to sideload using a Mac and the image's are :image-razorg-kot49h.zip
    06-14-2014 05:43 PM
  4. Drew Townes's Avatar
    I am stuck at finding the drivers and installing them
    06-19-2014 04:33 PM
  5. chipster314's Avatar
    I can't even get the ADT software to download.WTF. I click and agree and nothing happens.
    07-18-2014 09:06 PM
  6. SysVR's Avatar
    hellow
    help.

    my nexus 7 erasing userdata partition stuck.


    C:\afi>fastboot oem unlock
    ...
    <bootloader>Erasing userdata.....
    *stuck erase*
    08-04-2014 11:41 AM
  7. Chris Hom's Avatar
    I see alot of people lately having issues with the nexus lineups not updating correctly. Many times it displays errors such as "cannot open boot.img" etc. Generally speaking I have found this to be problematic, but have found a solution and since while browsing these forums gave me the answer, I thought I would relay it for anyone that has the same issue.

    It seems that in the new update packages android is giving out, the update is failing when trying to open the .zip that comes pre-packaged. In this zip you will find the following files generally: Userdata.img, boot.img, system.img, cache.img, recovery.img.

    If your included "flash-all" script is failing at this point, fear not.

    1) Run the flash-all and let it write the radio and bootloader (generally these are unproblematic).
    2) Extract the files from the zip archive and just place them next to the rest of them.
    3) Open a command prompt in that folder where you extracted your .img files to and manually input the flashing commands.
    • fastboot flash boot boot.img
    • fastboot flash cache cache.img
    • fastboot flash recovery recovery.img
    • fastboot flash system system.img
    • fastboot flash userdata userdata.img


    3* Or what you can do is open up your trusty notepad, and copy and paste this in:

    ECHO OFF
    timeout /t 15
    fastboot flash boot boot.img
    fastboot flash cache cache.img
    fastboot flash recovery recovery.img
    fastboot flash system system.img
    fastboot flash userdata userdata.img
    exit

    Save that as Flash.bat in your folder with all the unziped .imgs, and then double click on it and it should run and flash everything for you automatically as long as it is in the same folder as your .img files.

    Note: Credit to 2defmouze for coming up with the simple solution back in 2012
    12-27-2014 09:29 PM
  8. SysVR's Avatar
    ERROR:Boot Loader Locked...
    12-28-2014 12:22 AM
  9. Chris Hom's Avatar
    You have to unlock the bootloader. If you have the adb drivers installed system wide great. Just type in, in command prompt:
    fastboot oem unlock

    Now for this to work, you need to have the drivers installed on your computer for the device, have the necessary adb and fastboot commands either in the folder, or installed system wide, and you need to have debugging mode turned on. This process *last i checked* wiped all my data and apps so backup before.
    12-28-2014 03:17 AM
  10. SysVR's Avatar
    C:\afi>fastboot oem unlock
    ...
    <bootloader>Erasing userdata.....
    *stuck erase*
    after two hours in this state..
    12-28-2014 07:10 AM
  11. Chris Hom's Avatar
    I would personally try doing a factory reset, re-enable developer options, re-enable debugging via usb and try the command again.
    01-02-2015 09:38 PM
  12. SysVR's Avatar
    Recovery mode corruption(Stack.)
    OS boot impossible(Stack.)
    01-03-2015 10:50 AM
  13. Mateo Verax's Avatar
    THANKS SO MUCH!!! Great tutorial. In addition I used this "How to install ADB and Fastboot on Windows for use with Android [Guide]"
    to get the fastboot files I needed instead of waiting for the large and slow download of the entire android studio . I also found that other url I posted to have a quick link to the image I needed for my specific device. But guess what I used the latest android version instead of my old one and it worked great. Your tutorial was a diamond in the rough, and like finding a needle in a haystack , but well worth it because it proved to be the oasis, my glass of water in the desert. I found that Although I followed your steps my tab decided to reboot on it's own after that final step of installing the new / factory image. Also as a side note I downloaded the usb drivers for my device directly from Asus website and if anyone wants to know which nexus 7 they have like I did, the 2013 has a camera on the back, all else is 2012. I am pleased to announce that my 2012 nexus 7 16gb is running the latest lollipop 5.0.2 beautifully. And also to anyone else out there that went through something with this tablet, I had to fix the graphical error on my own, physically. I had a graphic problem with the tablet detecting multiple touches everywhere when I wasn't even touching, also it went green instead of true color. It seemed to be something I could physically effect though by slightly bending or putting pressure on the back. I opened it up, removed the copper thin metal strip over what I assume is the video card or cpu. And the relief of that metal strip off the back seemed to fix the color issue, I put a strip off double sided sticky "spongy" tape on the unit that I believed to be the source of the graphics problems and put the copper flap back over that but not in it's original form, slightly bent. It seemed that metal flap will still effect the graphics if I move it around but with the tape in place and it slightly bent, then putting the cover back on everything works fine. I know that sounds crazy just opening it up and bending crap and applying tape but it worked. No more graphic problems. Well that's just my share if someone like me stumbles upon this. Thanks again for that great walk-through and saving me from throwing away this "soft brick". And to think I found this thing on a bus! lol I tried to return it to owner but they didn't want it. Probably because of the problems it had..well that was last year and now it's better than new
    01-05-2015 09:04 AM
  14. litesport's Avatar
    Ok, stupid me appears to have bricked my 2012 Nexus 7 wifi.
    When I turn on my machine I get a black screen with a green arrow top right pointing to the power button, when I press this i get tiny writing saying booting failed.
    I was trying to downgrade from lollipop to JB using the tools from wugfresh.
    Anyway, it didn't work, so I tried to follow another threads instructions which I now cannot find. It involved running flash-all.sh in terminal.
    My nexus is unlocked and I can get to boot loader. i have access to both mac and pc.
    What can I do, please help.

    p.s. I know I screwed up, me bad. I'm was trying to learn and follow guides that I thought would work
    01-14-2015 02:05 PM
  15. khayfer1's Avatar
    So very lost, it is pathetic. I am using a Mac and I cannot get past step #6 instead this is what I get:
    android khayfer$ ./fastboot-mac flash bootloader bootloader-grouper-4.23.img
    -bash: ./fastboot-mac: No such file or directory
    I have the files in the same folder where my fastboot and adb files are located.
    Background:My nexus started doing the dancing circles and would never load, sent it a couple of times to Asus, it would work for a few weeks then again just restart and do the dancing circles. My warranty is now expired so I am trying to fix it before I give up on it. I never did connect it before to a computer, so I don't know if the debug was activated or not.
    In Recovery mode I get No command.
    Is there any way to fix this? should I just give up on it?
    Thanks in advance!
    01-25-2015 01:37 AM
  16. imtiaz vohra's Avatar
    Hi really useful instructions. I got as far as bootloader img stage on command prompt and it came up with an error FAILEd stuus read fialed too many links. I have attached a link
    Welcome any suggestions[GUIDE] Nexus 7 - Factory Image Restore-error-nexus.png
    01-28-2015 06:35 PM
  17. pfossi's Avatar
    My nexus 7 will not go to the bootlog page when I hold the vol down and power buttons. Instead it goes to the google logo and then goes to the robot that is standing up with a globe rotating in his stomac. This means I can't do step 4. How do I get around this?
    02-03-2015 08:16 PM
  18. omeryousaf's Avatar
    my google nexus 7 1st generation stuck on google screen and it wont erase data and no data partitioning,,,how it can be fix???
    02-05-2015 01:06 PM
  19. tselvana's Avatar
    hello i have the same problem did you ever find a solution
    03-06-2015 11:31 PM
  20. tselvana's Avatar
    I had a similar issue Try switching you USB port dont ask me why but it worked for me
    03-11-2015 11:10 PM
  21. Zeleia's Avatar
    Hello,

    I tried to downgrade my Lollipop 5.1.0 Nexus 7 to 4.4.4, however, I think I've downloaded and flashed the wrong factory image. I'm re-downloading the right one, however, is there anything I have to do, or should I just reflash the correct factory image?
    The cmd only displayed that my tablet is [grouper] therefore it couldn't be done.

    Thank you very much,
    04-11-2015 08:01 AM
  22. Golfdriver97's Avatar
    Hello,

    I tried to downgrade my Lollipop 5.1.0 Nexus 7 to 4.4.4, however, I think I've downloaded and flashed the wrong factory image. I'm re-downloading the right one, however, is there anything I have to do, or should I just reflash the correct factory image?
    The cmd only displayed that my tablet is [grouper] therefore it couldn't be done.

    Thank you very much,
    Welcome to the forums. Reflashing the proper image should be all you need to do.

    From an AOSP M8
    04-11-2015 08:11 AM
  23. edumasc's Avatar
    Hello guys,

    I made a beginner's mistake, instead of flashing the Kitkat Razor version to my Nexus 7 Wifi 2012, I flashed the Kitkat Nakasi. I tried to re-flash the tablet using the correct Kitkat Razor version, but my touchpad stopped working. Now I am stucked in the language selection screen without being able to move forward. What should I do?

    Thank you,
    Eduardo[GUIDE] Nexus 7 - Factory Image Restore-img_20150413_224805892.jpg
    04-13-2015 09:35 PM
  24. Chris Hom's Avatar
    Boot your device into the bootloader. With the power off, hold the power and volume down buttons ( I do believe that is correct for the nex 7 ). Then run your scripts via command line with fastboot scripts. "Fastboot flash system system.img" etc. Anyone coming across issues flashing and failing, I provided a little script above that manually flashes all the files to avoid that error. It also works for the rest of googles lineup.
    04-17-2015 12:36 PM
  25. Chris Hom's Avatar
    Hi really useful instructions. I got as far as bootloader img stage on command prompt and it came up with an error FAILEd stuus read fialed too many links. I have attached a link
    Welcome any suggestionsClick image for larger version. 

Name:	error nexus.png 
Views:	11 
Size:	27.6 KB 
ID:	161056
    Try renaming the bootloader to something simple. Like bootloader. Also make sure its the only bootloader IMG in your folder. For ease of use I always rename the main folder to something like android 5.1 Hammerhead and rename all the other files in that something simple. This means you generally have to manually flash the files but since 4.4 googles flashing scripts have rendered me incapable of doing it their way, having to manually flash all partitions myself to avoid errors.
    04-17-2015 02:31 PM
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