Trouble installing nethunter on nexus 9 tablet

[EDIT]
Problem solved, topic should be closed.
See the solution below, at the end of the post


Hi there,

After trying hard the entire day, I can't get nethunter working by myself, so I ask for you help.

I just bought a Nexus 9 tablet, Android 7.1.1 installed.

I am able to install back Android 6.0.1 (via google official factory images). I installed this ROM with the following commands :

Code:

---

fastboot flash bootloader bootloader-flounder-3.48.0.0135.img
fastboot reboot-bootloader
fastboot flash boot boot.img
fastboot flash recovery recovery.img
fastboot flash cache cache.img
fastboot flash system system.img
fastboot flash vendor vendor.img

---

The tablet is now back to factory condition under android 6.0.1

I can use TWRP (3.1.1) to install supersu (2.82).

Code:

---

adb reboot bootloader
fastboot boot twrpImage/twrp-3.1.1-0-flounder.img
adb push supersu/SuperSU-v2.82-201705271822.zip /sdcard/supersu.zip
adb shell "twrp install /sdcard/supersu.zip"

---

Supersu installation finishes without any error/failure.

I then push my nethunter image "nethunter-flounder-marshmallow-3.0.zip" to the tablet and tries to install it :

Code:

---

adb push kaliNethunter/nethunter-flounder-marshmallow-3.0.zip /sdcard/kaliNethunter.zip
adb shell "twrp install /sdcard/kaliNethunter.zip"

---

the installation goes all the way down to :

Code:

---

Checking for Kali Chroot in installer, this can take a while  ...

---

The progress bar in TWRP is actually at aproximately 90%. The tablet suddenly reboots, I have the kali/nethunter boot animation at startup, but nothing seems to be installed, I'm still under android 6.0.1 ...

Any help would be appreciate, I never played with phones/tablet this way before, I'm not very comfortable with all this :-)
If you need further logs/information, feel free to ask

Thank you by advance !

EDIT :

Problem solved, I found a nougat version of nethunter, packaging supersu
The installation succeeded !

Sorry for the useless post ...