Z3 dual D6633 BackupTA_V2 failed. Why?

[s0f0s]

Can not backup TA with BackupTA_V2 on Z3 dual with stock ROM. Will someone please help find out what is going wrong? Here are the details:

$ adb devices -l
List of devices attached
CB5A25TMFR             device usb:2-1.1 product:D6633 model:D6633 device:D6633

$ adb shell getprop ro.build.description
D6633-user 5.0.2 23.1.1.E.0.1 937646546 release-keys
$ adb shell cat /proc/version
Linux version 3.4.0-perf-g72984dd ([email protected]) (gcc version 4.8 (GCC) ) #1 SMP PREEMPT Fri Feb 27 18:06:32 2015
$ ./backupTA.sh
Running on D6633 on 32-bit platform
Pushing files
127 KB/s (13644 bytes in 0.104s)
109 KB/s (5364 bytes in 0.047s)
185 KB/s (9512 bytes in 0.050s)
98 KB/s (5416 bytes in 0.053s)
109 KB/s (5364 bytes in 0.047s)
23 KB/s (1094 bytes in 0.046s)
Running scripts to dump ta to "TA_D6633_CB5A25TMFR_20171203-1843.img" on device
Overwriting run-as
Attempting to dirtycow
Done dirtycowing
Overwriting secondary payload (screenrecord)
Attempting to dirtycow
Done dirtycowing
Reading dumpta from stdin...
Read dumpta from stdin at 0 bytes
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Attempting exploit with buf of length 0
Error loading source file: No such file or directory
Error dirtycowing, trying again...
Dumped TA as TA_D6633_CB5A25TMFR_20171203-1843.img
File: /data/local/tmp/TA_D6633_CB5A25TMFR_20171203-1843.img with size: 0x0 is not a valid dump!
Sorry trim area dump is corupted and not a safe, please try again!
Pulling image
remote object '/data/local/tmp/TA_D6633_CB5A25TMFR_20171203-1843.img' does not exist
Cleaning up
TA Backup Failed!! Please reboot and try again.
NOTE: If you are running Android Nougat, you need to downgrade to use this tool.
$

 

[s0f0s]

The solution was to update to Android 6.0.1
$ adb shell getprop ro.build.description
D6633-user 6.0.1 23.5.A.1.291 2769308465 release-keys
$ adb shell cat /proc/version
Linux version 3.4.0-perf-gc14c2d5 ([email protected]) (gcc version 4.9.x-google 20140827 (prerelease) (GCC) ) #1 SMP PREEMPT Tue Jun 28 11:15:51 2016

Now the backupTA_v2 workes.

Meanwhile I found out that backupTA.sh leaves two files (particularly dumpta and checkta) on the device:

echo "Cleaning up"
adb shell "rm -f /data/local/tmp/dirtycow /data/local/tmp/run-as /data/local/tmp/exploitta /sdcard/dumpta /data/local/tmp/backupTA.sh"

If you think that this information worth mentioning, please copy it to TA Backup v2 thread, cause I still can not