[Upgrading, Modifying and Unlocking] Floppyfish:
This has been a great forum so I thought I'd share my experience rooting another misc tablet from china. A reeder A7IX from Turkey. It has a nice 1920x1200 display, crappy z2520 processor.

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Possible Problem 1: 'fastboot oem unlock' does not work and I could only connect with fastboot under windows using the provided manufacturer flash tool from reeder. This lets you install a custom recovery.

Problem 2: there is no obvious custom recovery available for this device

Problem 3: most google searches for installing supersu require custom recovery :(

Problem 4: SRSroot, the first google hit, reports it is already rooted,as do root checking apps but it apps that require root do not work.

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Solution: since the 'adb root' command is successful, you can manually execute commands with adb to install SuperSU.

1. Go to http://xdaforums.com/showthread.php?t=1538053

Click CWM / TWRP / MobileODIN installable ZIP: http://download.chainfire.eu/supersu

(At this point you could try adb sideloading the zip, maybe it works? I didn't try it)

Extract the zip file to a place where you can access with ADB.

2. In the zip file there is a folder /META-INF/com/google/android/update-binary

Open update-binary in a text editor

At the top it has instructions on how to manually root. I followed the ones for API 7+ and 17+ and 19+ but not 20+ since it is android 4.2

Here is my copy from update-binary for example:

# To install SuperSU properly, aside from cleaning old versions and

# other superuser-type apps from the system, the following files need to

# be installed:

#

# API** source*********************** target***************************** chmod** chcon********************** required

#

# 7-19* common/Superuser.apk********* /system/app/Superuser.apk********** 0644*** u:object_r:system_file:s0** gui

# 20+** common/Superuser.apk********* /system/app/SuperSU/SuperSU.apk**** 0644*** u:object_r:system_file:s0** gui

#

# 17+** common/install-recovery.sh*** /system/etc/install-recovery.sh**** 0755*** *1************************* required

# 17+******************************** /system/bin/install-recovery.sh**** (symlink to /system/etc/...)******* required

# *1: same as /system/bin/toolbox: u:object_r:system_file:s0 if API < 20, u:object_r:toolbox_exec:s0 if API >= 20

#

# 7+*** ARCH/su********************** /system/xbin/su******************** *2***** u:object_r:system_file:s0** required

# 7+********************************* /system/bin/.ext/.su*************** *2***** u:object_r:system_file:s0** gui

# 17+******************************** /system/xbin/daemonsu************** 0755*** u:object_r:system_file:s0** required

# 17+******************************** /system/xbin/sugote**************** 0755*** u:object_r:zygote_exec:s0** required

# *2: 06755 if API < 18, 0755 if API >= 18

#

# 19+** ARCH/supolicy**************** /system/xbin/supolicy************** 0755*** u:object_r:system_file:s0** required

# 19+** ARCH/libsupol.so************* /system/lib(64)/libsupol.so******** 0644*** u:object_r:system_file:s0** required

#

# 17+** /system/bin/sh or mksh *3**** /system/xbin/sugote-mksh*********** 0755*** u:object_r:system_file:s0** required

# *3: which one (or both) are available depends on API

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What does it all mean? Basically you need to transfer files from the zip file using 'adb push' and then 'adb shell chmod' as per the above list. There is one 'ln -s' as well for install-recovery.sh. I found the chcon is not required and I ignored it. (ARCH is x86).

e.g. for the first line

# 7-19* common/Superuser.apk********* /system/app/Superuser.apk********** 0644*** u:object_r:system_file:s0** gui

you need to use the commands (where (ZIP/) is from where you extracted the ZIP file):

adb root

adb push (ZIP/)common/Superuser.apk /system/app/Superuser.apk

adb shell chmod 0644 /system/app/Superuser.apk

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The exception is

# 17+******************************** /system/bin/install-recovery.sh**** (symlink to /system/etc/...)******* required

adb shell ln -s /system/etc/install-recovery.sh /system/bin/install-recovery.sh

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Have fun! and of course at your own risk.