[ToolKit] Acer Iconia v0.9.4 ***New: Supporting Acer Liquid S1***

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nikagl

Senior Member
Jun 11, 2006
2,878
619
51
Nieuwegein, NL
OnePlus 6
Hi @nikagl I didn't notice that I was talking to the person that created the flashing firmware guide s: I gotta thank you for the guide and for the help provided from the past couple of days. I already did the steps on your guide on post #925 but I noticed that the guide is to flash stock ROM, and when I flashed the firmware, it worked because you explain the process very well. However I trully want to have total control of my device, meaning, have bootloader unlocked, CWM to flash stuff from SD card and most of all, root access. A did notice as well that, on the download section, there is a zip file called unlock B1-A71 which contains two folders: 4.1 Rescue and 4.1 Unlock. Is that the way to unlock bootloader and flash CWM? As it is not mentioned on your guide, how could I achieve that? How do I gain root access? I apologize for so many questions and I hope you can help me.

You should be asking in the other thread, this thread is not about that method. And yes, if you flash the stuff in the unlock folder, you will receive CWM. If you use CWM to flash SuperSU you can get root.
 

dasbermudezca

New member
Apr 22, 2016
1
0
Hi! Thank you for this work. My tablet is an Acer Iconia B1-A71 "RV05RC05"
I'm getting this problem:
E: No system.img.gz found in folder 'system_image' in toolkit directory.
The thing is i've already copyed the file "OS_Acer_Acer.AV051.B1-A71.RV05RC05.WW.GEN1_A41J_A.zip" that i downloaded from here.
I've followed all the steps carefully and I don't know what's wrong.
Can somebody help me please?!
 

redsucker12

New member
Dec 18, 2013
1
0
Acer Iconia B1-A71 need help

hi there, ive already manage to root my Acer Iconia B1-A71 with MOBOGENIE software in just on click and manually delete/uninstall some apps. i need help on what is the best thing to do after this? i dont understand on how to use the links that you post here and what is its benifits... can you please give me a short guide? BTW after uninstalling ive got some errors on my device. is there a way to reinstall there apps? my error was about android.acore? or something and has stop running. isnt it that ive uninstalled a wrong apps? but i made a backup before uninstalling but when i tried to restored it it says i dont have enought space. :( what should i do then? ty in advance :D
 

nikagl

Senior Member
Jun 11, 2006
2,878
619
51
Nieuwegein, NL
OnePlus 6
Hi! Thank you for this work. My tablet is an Acer Iconia B1-A71 "RV05RC05"
I'm getting this problem:
E: No system.img.gz found in folder 'system_image' in toolkit directory.
The thing is i've already copyed the file "OS_Acer_Acer.AV051.B1-A71.RV05RC05.WW.GEN1_A41J_A.zip" that i downloaded from here.
I've followed all the steps carefully and I don't know what's wrong.
Can somebody help me please?!

hi there, ive already manage to root my Acer Iconia B1-A71 with MOBOGENIE software in just on click and manually delete/uninstall some apps. i need help on what is the best thing to do after this? i dont understand on how to use the links that you post here and what is its benifits... can you please give me a short guide? BTW after uninstalling ive got some errors on my device. is there a way to reinstall there apps? my error was about android.acore? or something and has stop running. isnt it that ive uninstalled a wrong apps? but i made a backup before uninstalling but when i tried to restored it it says i dont have enought space. :( what should i do then? ty in advance :D

B1-A71 can be rooted with the other guides, like mentioned in many places in this thread:

So... why are you using this method and not the one recommended for your device?
[GUIDE] Firmwares, ROMs, CWM, Root - Acer Iconia (MTK) Tablets

I can't say anything about other guides on the internet. Also, ask questions in the relevant thread, in this case not here (noone knows about these methods in this thread as its about other methods). In the other thread, use one of the newer guides:
http://xdaforums.com/showpost.php?p=64178569&postcount=925
or
http://xdaforums.com/showpost.php?p=64677620&postcount=1000

Good luck.
 

Keizel

New member
May 12, 2016
4
1
Could reupload the file "A3-A10_RV05RC01_PA_CA" of Acer Iconia A3-A10? I want root this device and the other guide of this forum does not work to me.
 

persona78

Senior Member
Apr 12, 2013
2,635
1,376
Acer Iconia B1-720 - Links are dead

Acer Iconia B1-720: :(

RV03RC01_WW_GEN1:
system.img.gz (thx to Hayastan)

RV07RC01_WW_GEN1:
system.img.gz (thx to Hayastan)


Hi!
This links are dead, can you fix it?
Thanks
 

TheDevFreak

Senior Member
Mar 12, 2016
131
46
Need help with my tablet.

Hi, I bought my A1-80 a while back and I want to root it now. some time ago I tried to update to kitkat from about update but just got (and still do get) Update service temporarily unavaliable Status code: 1001. so that was out of the option, I put a microsd card into my tablet and downloaded the jellybean image from acer's site in hope that might get it working nope! when i tried to update from sd I got an error something to do with keys and the update was "acer-test-keys" and my tablet was "acer-test-k" here is a screenshot of my About tablet area: XDA won't let me post links yet so here it is i . imgur.com/dcGW6RL .png I was confused about which image thing to pick on here because my tablet says RV03RC08_WW_GEN1 but on here there is no RV03RC08_WW_GEN1 just a RV03RC08 image, Is that what I should use?
 

sugi6666

Member
Sep 10, 2010
29
15
[...]RV03RC08_WW_GEN1 but on here there is no RV03RC08_WW_GEN1 just a RV03RC08 image, Is that what I should use?

I guess so. If you have trouble updating, just use sp flash tool.
- download your system.img.gz and extract the "system.img"
- get Flash-Tool from here. http://www.mediafire.com/download/8mi71a1fs05qnap/A1-810+Unlock+and+CWM.rar
- navigate to drivers and install the MTK drivers, you might need to turn off the driver verification
- if drivers are installed correctly, navigate to SPFT open Flash-tool.exe
- in flash-tool open "scatter loading" and choose "/810 Unlock and CWM/MT6589_Android_scatter_emmc.txt" file
- uncheck everything (Preloader, Recovery) and check on "Android" and then choose your system.img
- press download, turn your tablet OFF and then connect to your PC
- wait until you see the green circle
 
Last edited:

AlimaneDz

Member
Jun 22, 2016
11
0
33
Oran
Then, for b1-710 the way to flash system.img via adb in meta mode should be:

1. copy system.img in sdcard (link to system image http://xdaforums.com/showpost.php?p=51716424&postcount=2897)
2. Insert sdcard in tablet
3. connect the tablet to your PC in meta mode and establish the adb connection following the advice given in the post

http://xdaforums.com/showpost.php?p=51671349&postcount=2868
http://xdaforums.com/showpost.php?p=51578861&postcount=2854

4. in the adb shell write the following commands:

cd mnt/sdcard2
dd if=/mnt/sdcard2/system.img of=/dev/block/mmcblk0p3

Thanks to:
- Gilly10 for the tips on how to connect in meta mode and adb connection,
- Hamza91 for the experienced the procedure

cannot open for write: Permission denied :(
 

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owerevoke

Member
Jun 27, 2016
29
3
London
Doesn't work

Then, for b1-710 the way to flash system.img via adb in meta mode should be:

1. copy system.img in sdcard (link to system image http://xdaforums.com/showpost.php?p=51716424&postcount=2897)
2. Insert sdcard in tablet
3. connect the tablet to your PC in meta mode and establish the adb connection following the advice given in the post

http://xdaforums.com/showpost.php?p=51671349&postcount=2868
http://xdaforums.com/showpost.php?p=51578861&postcount=2854

4. in the adb shell write the following commands:

cd mnt/sdcard2
dd if=/mnt/sdcard2/system.img of=/dev/block/mmcblk0p3

Thanks to:
- Gilly10 for the tips on how to connect in meta mode and adb connection,
- Hamza91 for the experienced the procedure

Hi, it doesn't work for some reason Maui and MTK Driod Tool both recognise it but the commands which you wrote doesn't work as the message in adb shell says 'Permission Denied'. The system.img is on the sd card and I tried to root it using MTK Driod Tools but it was unsucessfull. Any help?

Got the same problem as AlimaneDz does!
 
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iSigma

New member
Jul 7, 2016
1
0
RV21RC02_WW_GEN1 update.zip reupload please!

I've bootlooped my A1 810, can someone reupload the update.zip for RV21RC02_WW_GEN1?
 

sabbiu

New member
Aug 8, 2016
3
0
No menu when pressing "Power off" + "volume up", Acer Iconia A1-810

My tablet wont open. Also I cannot format it. While opening it shows acer logo for a while and then, this image (imgur [dot] com/LQPfOyC ) and auto reboots and repeats all these again and again.
Can anybody give me steps to fix it??
 

AlimaneDz

Member
Jun 22, 2016
11
0
33
Oran
My tablet wont open. Also I cannot format it. While opening it shows acer logo for a while and then, this image (imgur [dot] com/LQPfOyC ) and auto reboots and repeats all these again and again.
Can anybody give me steps to fix it??
you can connect the tablet to your PC in meta mode and establish the adb connection , yet i'm not sure that the following commands will work for you because i'm stuck at : cannot open for write: Permission denied
Code:
cd mnt/sdcard2
dd if=/mnt/sdcard2/system.img of=/dev/block/mmcblk0p3
see here how to connect in meta mode and download the attached Files :
http://xdaforums.com/showpost.php?p=51671349&postcount=2868
http://xdaforums.com/showpost.php?p=51578861&postcount=2854
Download Meta Mode
Good luck
 

RapGeneral

New member
Aug 16, 2016
2
0
I get an error: Couldnt connect to the device. Check if drivers are installed.
The thing is, that I installed the drivers, I enabled USB debugging and all, and still doesnt connect. Even my tablet says there is usb debugging going, but the program gives out an error. What do i do?
 

belots95

New member
Aug 25, 2016
1
0
Broken link

Can someone help me?
I can't find the prerooted image for a1-811

Thank you very much
 
Last edited:

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  • 156
    The Acer Iconia Toolkit is supporting following devices at the moment:
    • B1-A71
    • B1-710
    • B1-A710
    • B1-711
    • B1-720
    • A1-810
    • A1-811
    • A3-A10
    • Liquid S1

    Only use these methods if you are sure the device cannot be rooted using a custom recovery from the following thread:
    http://xdaforums.com/andr...ax-b1-t2875894

    Intel based devices will not be supported ever by this toolkit! Only Mediatek chips are supported!

    At the moment the following features are available:
    • Root from scratch (Unix only / recommended)
    • Root with prerooted Image (see Download links at the bottom)
    • Unroot
    • Swap External <-> Internal SD
    • Odex ROM
    • Pull system.img.gz off your device


    Download Acer Iconia Toolkit Latest Version

    Older Versions:



    Thank you goes to:



    Acer Iconia B1-A71:


    Unlock Bootloader
    CWM update, that removes bloat
    thx to FireDiamond

    Apply the "Invalid Partition Error" fix before rooting!!!
    To avoid unfixable bootloop, first apply this patch from Acer.
    Install the APK, start it, click on FixG1PMT (no feedback) and uninstall afterwards. Good luck!


    If you're rooting with prerooted system.img.gz here are the Downloads. Pick the one, fitting to the firmware installed on your tablet, otherwise you will get into bootloop!

    RV03RC05:
    Acer Firmware Update [mirror] [mirror + md5]

    RV04RC04:
    [system.img.gz] [mirror]

    RV05RC05:
    Acer Firmware Update [mirror1] [mirror2] [mirror3] [mirror4 + md5] [mirror5 + md5]
    [system.img.gz]

    RV02RC12:
    system.img.gz


    Acer Iconia B1-710 / B1-A710:


    Acer Iconia B1-711:

    RV01RC04_WW_GEN1:
    system.img.gz


    Acer Iconia B1-720:

    RV03RC01_WW_GEN1:
    system.img.gz (thx to Hayastan)

    RV07RC01_WW_GEN1:
    system.img.gz (thx to Hayastan)


    Acer Iconia A1-810:

    Acer Firmwares

    Modified XPosed Installer

    RV03RC08:
    system.img.gz

    RV18RC07_WW_GEN1:
    update.zip (about 4MB)
    system.img.gz with /system RW workaround (MD5 = 214db984aee42ef0c05d1cfa43d193c1) (needs extra config and SuperSU instead of Superuser) [torrent] (see this post also)

    RV21RC02_WW_GEN1:
    update.zip
    system.img.gz with /system RW workaround (needs extra config and SuperSU instead of Superuser) (see this post also)

    RV21RC03_TWN:
    system.img.gz with /system RW workaround (needs extra config and SuperSU instead of Superuser) (see this post also)

    RV27RC02_PA_CA:
    stock system.img.gz (rename to system.img.gz first!)
    system.img.gz (rename to system.img.gz first!)

    RV27RC03_WW_GEN1:
    system.img.gz
    stock system.img.gz
    update.zip

    RV18RC10_PA_CA:
    system.img.gz with /system RW workaround (needs extra config and SuperSU instead of Superuser) (see this post also)

    RV26RC06_PA_CUS1:
    system.img.gz

    Stock Images: (Workaround to unroot: Put the system.img.gz of your version into system_image and choose root option in toolkit)
    RV03RC08:
    system.img.gz

    RV18RC07:
    system.img.gz ( MD5=550ECDB192F5668264B11B1070F4B932 )


    How to root from scratch


    Acer Iconia A1-811:

    RV01RC11_WW_GEN1:
    Acer Firmware Update

    RV02RC20:
    system.img.gz rooted and stock (including xposed) (thx to konsolen!!)

    RV02RC22_TWN_GEN1:
    system.img.gz with /system RW workaround (needs extra config and SuperSU instead of Superuser) (see this post also)

    Unbrick:
    Stock Firmware RV01RC11 (copy on SD and flash from recovery)


    Acer Iconia A3-A10:

    A3-A10_RV05RC01_PA_CA:
    stock system image


    Your device not listed above?

    Help us getting your device to work with the toolkit.
    See this post how you can help.



    Common

    B1-A71 / B1-710 / B1-A710: Install this after rooting: Superuser App on Google Play Store
    A1-810 / A1-811 / B1-711: Install this after rooting: SuperSU App on Google Play Store
    Verify your root: Root Checker on Play Store


    FAQ

    Q: I'm stuck inside a bootloop after rooting!!!11
    A1: The system.img.gz you applied, wasn't suiting to the firmware version installed on your tablet. Download latest Acer firmware update ( !!! if available !!!), copy it on a micro sd card, plug it into your Iconia, go to recovery by holding Volume up and Power button while device is turned off. Then choose apply update from sd card.
    A2: If you cannot apply any Acer firmware, because you always get a partition error while installing, you should do a reboot after you get the error. A user reported that this made her/his device boot into Android again, showing the new version in settings -> info. Good luck
    A3: If your device is really bricked you could try bring it back to life. Here you find help: link1, link2, link3, link4 (many thanks to Gilly10, drmad and Hamza91)
    A4 (B1-A71, B1-710, B1-711 only): Unbrick
    A5: If the A1 - A4 didn't help. Send back the device to Acer. Tell them you tried to apply an update from sd card and ended up in this bootloop. Sending device back to Acer over UPS is free. Good luck!

    Q: Successfully rooted, but still no root after rebooting!
    A: Have you installed Superuser App from Google Play Store?
    (B1-A71 only)Q: Cannot update, always getting ERROR: - Invalid partition setting; 17: fat 238e8000:888e8000; Instalation aborted.
    A: Download "Invalid Partition Error" Patch.
    (B1-A71 only)Q: I applied update from RV05RC05 to RV05RC06 but still it shows RV05RC05.
    A: There is no RV05RC06. It is the RV05RC05. It got on Acers Download section with a RV05RC06 named zip file. But the content is 100% equal to RV05RC05.
    Q: Toolkit fails or crashes for any reason and I don't know what to do.
    A: Run it again with parameter -d, e.g.: toolkit.exe -d and post the entire output here.
    Q: Root from scratch on Linux doesn't work because of Error message: 'No such file or directory bin/posix/64/adb'
    A: sudo apt-get install ia32-libs libstdc++6 libgcc1 zlib1g libncurses5 libsdl1.2debian
    Q: Can i flash a custom recovery?
    A: No, because bootloader is locked. You would brick your tablet.
    Q: Are there Custom ROMs?
    A: No, see answer above.
    Q: Is my data wiped during root?
    A: No.
    Q: Do i lose root after factory reset or wipe date?
    A: No.
    Q: I get an error in Engineer mode entering telnet command.
    A: If Swiftkey is installed / enabled try settings Google AOSP Keyboard as default.
    Q: How can I start telnet server manually?
    A: Try this.



    What you can do with root:

    Apply Supercharger V6 by zeppelinrox and significally speed up your tablet! [My small How-To]
    Install Adaway, an ad-blocker for webbrowsers and apps containing ads.
    Install ROM Toolbox and customize boot screen and other funny things.
    Install Titanium Backup to Backup, Freeze, Uninstall any App and more.
    Install Datasync to sync app data like save states between rooted devices.


    What you can NOT do with root on these devices:

    Change DPI
    Flash Custom Recoveries
    Flash Custom ROMs



    Sources and Changelos @ github (thanks to nikagl)

    24
    Changelog:

    v0.9.4
    ======
    - Updated SuperSU to 2.46
    - Removed Xposed APK
    - Added Liquid S1 support!

    v0.9.3
    ======
    - Fix Xposed removal
    - Wait longer for MTKLogger to press settings
    - Add 811 and KK 810 and 811 to root from system.img

    v0.9.2
    ======
    - Removed Xposed till it works
    - Add global for allatonce

    v0.9.1

    ======
    Added option to enable write access to external sdcard
    Added comment for Xposed not working
    Removed su delete command in invalid section

    v0.9.0
    ======
    - A1-811: Kitkat Support
    - A1-xxx: Added proper su-binary
    - Added timestamps
    - Added descision for Superuser/Supersu
    - Added selection for Xposed **not working yet**
    - Added option to enable write access to external sdcard
    - Added selection to continue automatically (also import the system instead of waiting for enter)
    - Removed invalid quote and double exit command
    - Added forward delete of characters to make sure Run command is empty
    - Added some additional messages during the root process

    v0.8.5
    ======
    - A1-810: Fixed target directory for system image (no permissions for /cache directory since Kitkat)
    - A1-810: Fixed root from scratch for Kitkat versions (thanks to Just_Another_N00b)

    v0.8.4
    ======
    - A1-810: Fixed root for Android Kitkat >= 4.4.2
    - A1-810: Fixed abd devices id, changed sind Kitkat update

    v0.8.3
    ======
    - Fixed pulling system.img.gz from Windows

    v0.8.2
    ======
    - New: Supporting B1-720

    v0.8.1
    ======
    - A1-81x: Fixed missing read/write permissions for /system partition (thanks
    to twu2!)
    - All other devices: fixed missing path to su binary (thanks to arzakon.nn)

    v0.8.0
    ======
    - New: Pull system.img.gz from your tablet
    - New: Supporting A3-A10

    v0.7.8
    ======
    - fixed Swap Internal to External for A1 and B1-710

    v0.7.7
    ======
    - Supporting Swap Internal to External for A1 and B1-710
    - fixed bug in root from scratch: checking for /bin/su although it's not there


    Full Changelog inside the Download.
    14
    B1-A71 Unlocked bootloader + CWM

    FOR ALL B1-A71 USERS
    SOMETHING GREAT HAPPENED

    Unlocked bootloader + CWM
    11
    A1-810 4.4 WAS UNLOCKED
    Guide.

    Thanks to Acer A1-810 Devils: @Calingo, @vache, @Shreps, @swing4thefence, @FireDiamond.
    9
    Ok, got the tab. I'm setting every thing up (USB drivers, ADB, finding where USB damiliarebugging is etc). I fired-up the tool and went through some steps to get familiar with it, then a question popped in my head: The choices are "root" "unroot" etc so to "root from scratch" do i select "root"? Do i still move the prerooted image into the folder or not? I'm confused cause i seam to have read somewhere that the tool can read the image on the tab, fix it, then rewrite it back to the tab (i may be totally mistaken).

    Basically, what does "root from scratch" mean? is the same as "root" in the tool?

    Again, Thanks in advance.

    2013-12-05 UPDATE

    Since it's already version 0.8.1, user can finish root procedure and R/W Workaround automatically with the latest toolkit for A1-810, A1-811. My instructions for R/W Workaround may be no longer needed.

    Even there's a system.img.gz for your device, I still suggest you do root from scratch by yourself to prevent any problem.

    OK, let's get started

    Q:The choices are "root" "unroot" etc so to "root from scratch" do i select "root"?

    A:When you open toolkit.sh in linux, choose A1-810->root->There will be two choices, one is root from scratch, and the other one is root from prerooted system.img.gz. You should only move system.img.gz to the system_image folder if you have one, root from scratch does not require system.img.gz in system_image folder.

    Q:Basically, what does "root from scratch" mean? is the same as "root" in the tool?

    A:There are two ways to perform root in this toolkit. First is root from scratch, this will take files directly from your device and root it. After the toolkit puts an su into it, it will put the files back to your device so your tablet gets root permission(Of course you have to install supersu for sure). If it's root from prerooted system.img.gz, it means you use others system.img.gz made by root from scratch, which you can just download it for toolkit, and gets root permission by it.

    Can you give me your device's version information, so I can give you some help. You can find it in "about tablet". Seems like you are already using Linux. You can use the system.img.gz made by others if you have the same version on device. A prerooted system.img.gz will both work for windows and linux, follow the instructions below. Root from scratch only availiable for Linux, follow the For Linux section. I highly suggest you to read the R/W fix part first, so you can use most of the root required apps without problems.

    First of all, do you have the same version of system.img.gz in your device's "about tablet". If you do have the same version, download the system.img.gz and put it into the "system_image" folder. With the system.img.gz, you can easily root under windows.

    For Windows:
    First thing first, download the system.img.gz you need and put it into system_image folder.

    1.Download the latest toolkit then open the toolkit.exe

    2.Choose A1-810

    3.Choose Root

    4.Follow the toolkit's instructions and finish root

    5.Unplug till the root opertion is finished.

    If there's no same version of system.img.gz compare to your device, do the root under Linux. I myself used Lubuntu with Oracle VM VirtualBox.


    For Linux:
    1.Open a terminal

    2.Type "sudo su"

    3.Type "chmod 777 your toolkit.sh" Example: chmod 777 /root/toolkit.sh

    4.Type "your toolkit.sh" Example: /root/toolkit.sh

    5.Choose "A1-810"

    6.Choose "Root from scratch"(Or choose Root from prerooted system.img.gz if you have it. It's the same as Windows. Remember to put system.img.gz into system_image folder)

    7.Follow the toolkit's instructions and finish root

    8.Unplug till the root opertion is finished.

    The toolkit's version is now 0.7.6, and R/W Workaround feature is now fixed again. With 0.7.6, users don't have to apply R/W Fixes by themselves. Use 0.7.4 instead if users want to perform root safer. The followings were done with toolkit 0.7.4, lubuntu, A1-811. This will also work for A1-810(Thanks to treetop777)

    In order to make a system.img.gz with R/W fix, follow these instrutions

    You can only do the followings when you are performing root from scratch. If you're using root from prerooted system.img.gz, download the ones with R/W Workaround. If there's no system.img.gz for you, follow the instructions and make one by yourself.

    First of all, cancel the operation of the toolkit when it's copying system.img.gz back to your tablet. We don't have to finish the whole operation yet.

    Download the su.tgz https://docs.google.com/file/d/0Bz5DDMjsS0KMdHpvbEk3Y1ZNVDA/edit?usp=sharing

    1.Open a terminal under Linux

    2.type "sudo su", you may have to type your password here.

    3.type "gzip -d your system.img.gz Example:gzip -d /root/toolkit/system.img.gz(if your system.img.gz is under /root/toolkit)", now you have your system.img

    4.type "mkdir /mnt/a1(mkdir means make a folder, so here it means I make a folder named a1 under /mnt)"

    5.type "mount -o loop your system.img /mnt/a1 Example: mount -o loop /root/toolkit/system.img /mnt/a1"

    6.Place the su.tgz under any folder (In this example I put my su.tgz under /root)

    7.back to terminal, and type "cd /mnt/a1; tar zxvf your su.tgz Example: cd /mnt/a1; tar zxvf /root/su.tgz"

    Edit, thanks to fREAST0
    7.5. type "chmod 6755 /mnt/a1/xbin/su; chmod 6755 /mnt/a1/bin/su"

    8.type "cd /root; umount /mnt/a1"

    9.type "gzip -9v your system.img Example: gzip -9v /root/toolkit/system.img", now you have your system.img.gz back.

    10.Congradulations, you have a system.img.gz with R/W Workaround now, put it back into /system_image and root from prerooted system.img.gz, finish the opertion and you device will be rooted.

    2013-10-23 Update

    If users are facing problems even if you have R/W Workaround, try to delete or rename the /system/bin/su to make the /system/xbin/su work. I'm not quite sure, but my root permission is working fine without /system/bin/su and I can update my su binary with supersu.