Has anyone rooted or ROM'd the MID7120-4G yet??

Discussion in 'Coby Generation 2' started by barcodelinux, Dec 7, 2011.

  1. barcodelinux

    barcodelinux Member

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    I just bought this tablet on ebay for $100 and figured I'd give it a shot. I am not sure if this thing is a Gen 1 or a Gen 2 device because it has an ARM6 clocked to 800Mhz but it does ship with Gingerbread. Coby doesn't even have it listed on their site. My end goal is to be able to get CM7 or some other AOSP based ROM on this thing and overclock it to 1Ghz to speed it up.

    I tried using the z4root v1.3.0 method without success. It gets to the "Acquiring root shell" screen and crashes.

    I tried to manually root it using adb in Linux but could not find a writeable partition to copy psneuter and busybox binaries to. I tried to push them to the /sdcard and /storage partitions and then execute then from there but then could not chmod them afterwards. Weird, right?

    I don't have a Windows machine other than and XP install in VirtualBox but the problem is that the USB passthrough doesn't see the tablet so the SuperOneClick method won't work there either. Can someone with a 7120 and a Windows machine verify that this method even works on this tablet?

    I did get the market installed but that's about it. Anyone have any ideas?
     
  2. lfom

    lfom Senior Member Developer

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    Latest SuperOneClick should work, look for tutorials for 7022, 7012 or even 7127. They should work for 7120 as well.
     
  3. barcodelinux

    barcodelinux Member

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    I was afraid that you might say that. Now I have to buy another HDD to install XP on just to do this.

    Even if I get it rooted and clockwork recovery installed, are there any ROM's that would boot on this thing?
     
    Last edited: Dec 7, 2011
  4. lfom

    lfom Senior Member Developer

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    I don't think you have to have XP, I think it works with Win7 as long as it's 32-bits. Might even work in 64-bits if you install the correct drivers.

    AFAIK no custom ROMs for either 7012 or 7120.
     
  5. barcodelinux

    barcodelinux Member

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    Well, I installed a 32bit XP. Got ADB installed. ADB can see the device and gives a serial number. Fired up SuperOneClick 2.3.1 and clicked on Root. After several restarts of adb, SOC froze. I restarted adb and SOC. This time I clicked on Shell Root and it got all the way to "Pushing File ........0.27s" and it locked up again.

    Looking at the logs, it seems as though it ran into the same problem I did earlier. It couldn't find a writeable directory for the exploit and it just restarted the adb server and froze.

    I don't understand why this thing is so hard to root given that it is a generic device. Are there any other methods for rooting?
     
  6. crazythunder

    crazythunder Member

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    do you have anything else running that might be using adb? like droid explorer? try going into task manager and kill the adb service. then try it again. if that fails, kill adb, unplug phone, plug back in after a few seconds, try rooting again. you could also try installing adb with pda.net drivers or droid explorer.
     
  7. lfom

    lfom Senior Member Developer

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  8. crazythunder

    crazythunder Member

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    you're right, because i tried the normal root option with no luck on my 7127. i had to use shell root.
     
  9. barcodelinux

    barcodelinux Member

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    Last edited: Dec 18, 2011
  10. barcodelinux

    barcodelinux Member

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    I did not try the pda.net method though. I just downloaded adb from google, installed it. It prompted me to install java JDK, so I did and continued with the adb install. Once I got everything up and running, and before firing up SOC, I ran adb devices to make sure that I could see it. It reported the serial number and as "device" so the laptop could see the tablet. That's when I fired up SOC and ran into those problems listed above. The problem I was having was that there is ZERO documentation on the developers site on how to use SOC. I started with "Root" and when that didn't work, I went to "Shell Root".

    I spent about 4 hours last night trying to root this thing without success. I google'd around and found out about the multiple adb processes. I tried many times (both root and shell root) with taskmgr.exe open and actively killing all but the first adb.exe process. I tried unplugging the device and starting over, even rebooting my xp install. (God I hate windows!)

    This is actually a christmas present for the wife so I have limited time to play with this thing. I will try again tonight and report back.
     
    Last edited: Dec 18, 2011
  11. barcodelinux

    barcodelinux Member

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    I wonder if there is a way to mount the /system partition while in the android recovery mode using adb. That way I can edit /etc/fstab (or whatever its called in android) and set the /system partition to mount as rw at boot. That way when it boots, I can push the files needed to the /system partition, chmod them, and execute them and finally get this thing rooted. Then before I reboot, edit /etc/fstab again to make /system mount as rw by default.

    Maybe?? I will try it here in a few.

    EDIT: Nope!! I was thinking of CWM recovery. The stock android recovery is VERY limited in what it can do.
     
    Last edited: Dec 19, 2011
  12. barcodelinux

    barcodelinux Member

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    Ok, I tried the SOC method again just for grins. No dice. Everytime I click on Root or Shell Root, 2 adb.exe processes start and if I kill one of them, SOC stops what it was doing and goes back to where it started.

    I tried building an update.zip package with a script that would install the su, busybox, and psneuter binaries AND CWM recovery. No dice.

    I tried Universal Androot v1.6.1. No dice.

    Anyone got any ideas? I can't be the only one with this tablet that wants to root it.
     
  13. rafi

    rafi Member

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    I'm definitely waiting for a rooting walkthrough, some ROMs, flash installation, and an update to market.

    VTL.Launcher v.1.6.5 works great on the 7120, BTW.
     
  14. barcodelinux

    barcodelinux Member

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    I have given up. I put it up on CL yesterday and sold it a few hours ago. It's too bad.

    This could have been a cool little toy to play with. Good luck to all of you who still have this tablet.
     
  15. pearljame

    pearljame Member

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    I managed to do Root:
    [h=2]SuperOneClick v2.3.1 - Automatic Driver Installation![/h]
    Download
    [APP]SuperOneClick v2.3.1 - Automatic Driver Installation! - xda-developers

    Extract the file, open as administrator and go into Driver Update, after you install the drive click Root, when to stop with the message waiting device click again in Root that will work ... (Tested in Windows 7 Ultimate)

     
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