MID7035-4 Changing MAC Address on Each Restart

Discussion in 'Coby Generation 3' started by FrankS, Jan 1, 2014.

  1. FrankS

    FrankS Member

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    I just purchsed this tablet as a refurb from Newegg, and generally I've very pleased with it. My sole issue with it is this: THe MAC address changes everytime it is powered off and back on again.

    First off, other than deliberate hacks and spoofs, I didn't think this was possible. It's a serious problem for me since my wireless AP uses MAC filtering as a part of my network security. Therefore, I have to go into the router to change the tablet's MAC in the 'allow' table to get it to connect.

    I have tried various searches to find information, but the only things I found were dead ends.

    Anyone have any ideas?
     
  2. vampirefo.

    vampirefo. Senior Member Developer

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    Ok never heard of this, does the tablet factory reset each boot or just lose wifi?
     
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  3. FrankS

    FrankS Member

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    The best I can tell, only the MAC address changes. It's definitely not a factory reset as everything like the wallpaper, sound settings, DL'd apps remain unchanged.
    Also, to be clear, the WiFI remains working, but since the MAC has changed, my AP simply refects the connection.
     
  4. vampirefo.

    vampirefo. Senior Member Developer

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    I can't think of anyway that the MAC address would change unless you are using the wrong MAC address, Where are you getting the tablet's MAC address from?
     
    Last edited: Jan 2, 2014
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  5. FrankS

    FrankS Member

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    Settings>About Tablet>Advanced ..going off the top of my head here since I dn't have the tablet in front of me at the moment. I have noticed that the MAAC addy from this location, and the one found under Wireless>Advanced are not always the same. However, the Settings>About>Advanced route is the one the AP always sees.

    And you make my point exactly. To my knowledge, this really shouldn't be possible.
     
  6. vampirefo.

    vampirefo. Senior Member Developer

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    Ok makes a little more sense to me, you are relying on the tablet's software to tell you the MAC address.

    Lets find how many MAC address your tablet has, and then let's find the one related to wifi.


    adb shell

    Code:
    busybox ifconfig -a | busybox awk '/HWaddr/ {print "Interface: " $1 "\t MAC: " $NF}'
    my output from tablet I am using right now.

    Interface: gre0 MAC: 00-00-00-00-1F-00-40-4B-00-00-00-00-00-00-00-00
    Interface: ip6tnl0 MAC: 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
    Interface: tunl0 MAC: 00-00-00-00-00-00-10-00-00-00-00-00-00-00-00-00
    Interface: wlan0 MAC: 20:59:A0:3D:08:9F


    Ok now we see the wifi one, it's wlan0, let's target it only.

    Code:
    busybox ifconfig -a | busybox grep wlan0
    my output from my tablet.

    wlan0 Link encap:Ethernet HWaddr 20:59:A0:3D:08:9F
     
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  7. vampirefo.

    vampirefo. Senior Member Developer

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    Off topic would you be willing to post out of

    adb shell

    cat /proc/mtd

    and right after boot up

    adb shell

    dmesg > /sdcard/dmseg.txt

    then upload the dmseg.txt from your sdcard.

    if you would do a full dump of your tablet and upload it that would benefit a lot of people including yourself.

    right now if your tablet bootloops or fails to work there is no software available to fix it.

    Most people that come here with a 7035 or 7033 has already broken their tablet, and didn't backup their tablet so we can't help them fix it.
     
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  8. mcclain_ts

    mcclain_ts Senior Member

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    "Most people that come here with a 7035 or 7033 has already broken their tablet, and didn't backup their tablet so we can't help them fix it."

    ----------------------------------------------------------------------------------------
    SO TRUE!!! Most people do act hastily (out of excitement) when they get a tablet. It DOES pay to slow down just a little, AT LEAST make a WORKING/USABLE/GOOD dump of the unit IN WORKING order, because you can SURELY save yourself a BUTTLOAD of stress and anxiety later. It WILL make recovery(should you or someone else brick/softbrick the tablet) a WHOLE LOT EASIER!!!(warm smilz) Do us all a great favor.(including yourself) Take a little time, and make those backups! Maybe not right this moment, but before the thing becomes bricked. Believe it or not, a tablet can even brick itself mysteriously. Through the download/install of some certain apps even. It is possible. So save the headaches, and get yourself a dump, or a clockworkmod nandroid backup.(If you can/possible)
    Have a great day!
     
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  9. mcclain_ts

    mcclain_ts Senior Member

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    ------------------------------------------------------7033--------------------------------------
    Per Vampirefo.'s request, here's my "semi-rooted" mid7033 (USB debugging drops with each re-boot) cat /proc/mtd -

    cat /proc/mtd
    dev: size erasesize name
    mtd0: 00a00000 00100000 "SysInfo"
    mtd1: 00c00000 00100000 "Uboot"
    mtd2: 02000000 00100000 "kernel"
    mtd3: 01600000 00100000 "RKer"
    mtd4: 18200000 00100000 "System"
    mtd5: 68100000 00100000 "Data"
    mtd6: 20000000 00100000 "Cache"
    mtd7: 5b000000 00100000 "user"
    ----------------------------------------------
    and my lengthy "dmesg > /sdcard/dmseg.txt" can be found on my GoogleDrive here: 7033 dmesg

    Hope this helps! I still need to get this fully changed over using Vampire's methods for full root access, and so the USB debugging isn't lost on each shutdown/reboot.(I just haven't had time to use the tablet lately.) Now I see, I need to also pay attention to my previous post here too.(smilz) But I already took the time to dump this beast in advance. And the 7033s/7035s,... they are small, but a HUGE pain in the butt so far for Vampire! Thanks for ALL the time and energy you have and continue to contribute to these notorious-but-nice tablets!(warm smilz)
     
    Last edited: Jan 3, 2014
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  10. mcclain_ts

    mcclain_ts Senior Member

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    If I ever get a working 7035, I'll post that here too.(smilz)
     
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  11. FrankS

    FrankS Member

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    I'd be happy to do that and post the results, but i need one thing first. Someone please tell me exactly HOW to get that dump. I'm decent with networking, better with PC's, but frankly I'm just startign to learn about tablets...soo..educate me, please ....
     
  12. vampirefo.

    vampirefo. Senior Member Developer

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    Here is a rooting guide for 7033, don't flash the recovery or boot.img this is for 7033, the root and backup should be the same though.

    http://www.androidtablets.net/forum...oby-7033-root-recovery-unsecure-boot-img.html

    adb push data /data/local/tmp/

    adb shell

    chmod 0777 /data/local/tmp/pwn

    chmod 0777 /data/local/tmp/root.sh

    /data/local/tmp/pwn

    exit

    adb shell

    /data/local/tmp/root.sh

    at this point you should be rooted, your adb shell should have went from $ to #,

    You should now dump your tablet.

    mkdir /sdcard/dump


    cat /dev/mtd/mtd2 > /sdcard/dump/boot.img
    cat /dev/mtd/mtd3 > /sdcard/dump/recovery.img
    cat /dev/mtd/mtd1 > /sdcard/dump/bootloader.img

    busybox tar -czvf /sdcard/dump/coby_7035_system.tgz /system
     
    Last edited: Jan 3, 2014
  13. FrankS

    FrankS Member

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    It might be a couple days, mainly because I want to carefully read through the rooting guide and have some undisturbed time to do this. But I will get it done, and upload the dump.

    If I understand this right, essentially I'm producing an image of the OS as installed, but not altering any of the settings ..since I'm not doing the flash part?
     
  14. vampirefo.

    vampirefo. Senior Member Developer

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    No problem take your time, and yes you are just copying your tablets software, not installing.
     

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