[Android Software/Hacking General [Developers Only]] barvaz:
This method did not work with my NextBook 7:

C:\RW_HTC_Flyer(1)>adb wait-for-device

C:\RW_HTC_Flyer(1)>adb push fre3vo /data/local/tmp
3188 KB/s (9796 bytes in 0.003s)

C:\RW_HTC_Flyer(1)>adb shell chmod 777 /data/local/tmp/fre3vo

C:\RW_HTC_Flyer(1)>adb shell /data/local/tmp/fre3vo
fre3vo by #teamwin
Please wait...
This device either does not support the fre3vo exploit, or this
account lacks permission to access the required devices.
An error has occured.

C:\RW_HTC_Flyer(1)>adb wait-for-device

C:\RW_HTC_Flyer(1)>adb shell /data/local/tmp/fre3vo
fre3vo by #teamwin
Please wait...
This device either does not support the fre3vo exploit, or this
account lacks permission to access the required devices.
An error has occured.

C:\RW_HTC_Flyer(1)>adb wait-for-device

C:\RW_HTC_Flyer(1)>adb shell sleep 5

C:\RW_HTC_Flyer(1)>adb remount
remount failed: Operation not permitted

C:\RW_HTC_Flyer(1)>adb shell mount -o rw,remount rootfs /
mount: Operation not permitted

C:\RW_HTC_Flyer(1)>adb shell mount -o remount,suid /dev/block/mmcblk0p29 /data
mount: Operation not permitted

C:\RW_HTC_Flyer(1)>adb shell rm -r /vendor
rm failed for /vendor, Read-only file system

C:\RW_HTC_Flyer(1)>adb shell mkdir /system/vendor
mkdir failed for /system/vendor, Read-only file system

C:\RW_HTC_Flyer(1)>adb shell mkdir /system/vendor/bin
mkdir failed for /system/vendor/bin, No such file or directory

C:\RW_HTC_Flyer(1)>adb shell chmod 777 /system/vendor
Unable to chmod /system/vendor: No such file or directory

C:\RW_HTC_Flyer(1)>adb shell chmod 777 /system/vendor/bin
Unable to chmod /system/vendor/bin: No such file or directory

C:\RW_HTC_Flyer(1)>adb shell chmod 4755 /system/bin/sh
Unable to chmod /system/bin/sh: Read-only file system

C:\RW_HTC_Flyer(1)>adb push sqlite3 /system/vendor/bin
failed to copy 'sqlite3' to '/system/vendor/bin': No such file or directory

C:\RW_HTC_Flyer(1)>adb push libext4_utils.so /system/lib
failed to copy 'libext4_utils.so' to '/system/lib/libext4_utils.so': Read-only f
ile system

C:\RW_HTC_Flyer(1)>adb push libfuse.so /system/lib
failed to copy 'libfuse.so' to '/system/lib/libfuse.so': Read-only file system

C:\RW_HTC_Flyer(1)>adb shell chmod 655 /system/lib/libext4_utils.so
Unable to chmod /system/lib/libext4_utils.so: No such file or directory

C:\RW_HTC_Flyer(1)>adb shell chmod 000 /system/lib/libfuse.so
Unable to chmod /system/lib/libfuse.so: No such file or directory

C:\RW_HTC_Flyer(1)>adb push default.prop /default.prop
failed to copy 'default.prop' to '/default.prop': Read-only file system

C:\RW_HTC_Flyer(1)>adb push init.rc /init.rc
failed to copy 'init.rc' to '/init.rc': Read-only file system

C:\RW_HTC_Flyer(1)>adb push init.flyer.rc /init.flyer.rc
failed to copy 'init.flyer.rc' to '/init.flyer.rc': Read-only file system

C:\RW_HTC_Flyer(1)>adb shell chmod 755 /default.prop
Unable to chmod /default.prop: Read-only file system

C:\RW_HTC_Flyer(1)>adb shell chmod 755 /init.rc
Unable to chmod /init.rc: Read-only file system

C:\RW_HTC_Flyer(1)>adb shell chmod 755 /init.flyer.rc
Unable to chmod /init.flyer.rc: No such file or directory

C:\RW_HTC_Flyer(1)>adb push fixit /system/vendor/bin
failed to copy 'fixit' to '/system/vendor/bin': No such file or directory

C:\RW_HTC_Flyer(1)>adb push su /sbin
failed to copy 'su' to '/sbin/su': Permission denied

C:\RW_HTC_Flyer(1)>adb push su /system/vendor/bin
failed to copy 'su' to '/system/vendor/bin': No such file or directory

C:\RW_HTC_Flyer(1)>adb push busybox /system/vendor/bin
failed to copy 'busybox' to '/system/vendor/bin': No such file or directory

C:\RW_HTC_Flyer(1)>adb shell chmod 4755 /sbin
Unable to chmod /sbin: Read-only file system

C:\RW_HTC_Flyer(1)>adb shell chmod 4755 /sbin/su
Unable to chmod /sbin/su: Permission denied

C:\RW_HTC_Flyer(1)>adb shell chmod 4755 /system/vendor/bin/su
Unable to chmod /system/vendor/bin/su: No such file or directory

C:\RW_HTC_Flyer(1)>adb shell chmod 4755 /system/vendor/bin/fixit
Unable to chmod /system/vendor/bin/fixit: No such file or directory

C:\RW_HTC_Flyer(1)>adb shell chmod 4755 /system/vendor/bin/busybox
Unable to chmod /system/vendor/bin/busybox: No such file or directory

C:\RW_HTC_Flyer(1)>adb shell chmod 755 /system/vendor/bin/sqlite3
Unable to chmod /system/vendor/bin/sqlite3: No such file or directory

C:\RW_HTC_Flyer(1)>adb shell /system/vendor/bin/busybox --install -s /system/ven
dor/bin
/system/vendor/bin/busybox: not found

C:\RW_HTC_Flyer(1)>adb shell rm -r /system/vendor/bin/ls
rm failed for /system/vendor/bin/ls, No such file or directory

C:\RW_HTC_Flyer(1)>adb shell rm -r /system/vendor/bin/reboot
rm failed for /system/vendor/bin/reboot, No such file or directory

C:\RW_HTC_Flyer(1)>adb shell rm -r /system/vendor/bin/chmod
rm failed for /system/vendor/bin/chmod, No such file or directory

C:\RW_HTC_Flyer(1)>adb shell rm -r /system/vendor/bin/chown
rm failed for /system/vendor/bin/chown, No such file or directory

C:\RW_HTC_Flyer(1)>adb install Superuser.apk
5818 KB/s (196640 bytes in 0.033s)
pkg: /data/local/tmp/Superuser.apk
Failure [INSTALL_FAILED_ALREADY_EXISTS]

C:\RW_HTC_Flyer(1)>adb install androidterm.apk
6039 KB/s (92780 bytes in 0.015s)
pkg: /data/local/tmp/androidterm.apk
Failure [INSTALL_FAILED_ALREADY_EXISTS]

C:\RW_HTC_Flyer(1)>adb shell ln -s /system/vendor /vendor
link failed File exists

C:\RW_HTC_Flyer(1)>adb wait-for-device

C:\RW_HTC_Flyer(1)>adb shell sync

C:\RW_HTC_Flyer(1)>pause
Press any key to continue . . .