Building tegra note 7 image from Sources

There's an old tergra note 7 lying around, so I thought to make it usable by building the image from sources and eventually upgrade to a new version ( just a thought).

Here starts my journey

• Found a guide from nvidia to build and flash (which seems to be very old but links are working )
  https://nv-tegra.nvidia.com/gitweb/?p=manifest/android/binary.git;a=blob;f=tegranote7cw_README;hb=refs/heads/rel-tegranote-partner
• While setting up the environment for build got errors while executing setpath command (after . build/envsetup.sh)

build/core/config.mk:454: *** Error: could not find jdk tools.jar, please check if your JDK was installed correctly.  Stop.
build/core/config.mk:454: *** Error: could not find jdk tools.jar, please check if your JDK was installed correctly.  Stop.
build/core/config.mk:454: *** Error: could not find jdk tools.jar, please check if your JDK was installed correctly.  Stop.
build/core/config.mk:454: *** Error: could not find jdk tools.jar, please check if your JDK was installed correctly.  Stop.
build/core/config.mk:454: *** Error: could not find jdk tools.jar, please check if your JDK was installed correctly.  Stop.
Can't find toolchain for unknown architecture: 
build/core/config.mk:454: *** Error: could not find jdk tools.jar, please check if your JDK was installed correctly.  Stop.
build/core/config.mk:454: *** Error: could not find jdk tools.jar, please check if your JDK was installed correctly.  Stop.
build/core/config.mk:454: *** Error: could not find jdk tools.jar, please check if your JDK was installed correctly.  Stop.

Solution : Installed jdk 8, changed default java to java 8 using update-alternatives --config since I already had java 11 as default. Host OS: ubuntu 18.04.

• While I was doing this setup, found some prebuilt images and tried to flash those. Now I bricked my device. It's in APX mode :(
• Found a discussion (https://forum.xda-developers.com/t/nvidia-tegra-note-7-apx-images.3149839/) to recover from APX mode with images but binaries are for windows. Ah! now I have to boot windows where I will get distracted by cities skylines.
• Let find some generic recovery for APX boot.
• Didn't find anything for linux, went to Windows
• After fiddling around and installing APX driver on Windows, somehow the board got shot in it's heart. It's dead :( completely.
• The board is dead completely. Even linux dmesg now doesn't show anything.
• End of the day.

Lessons learnt, through away old sluggish hardware, doesn't waste time om those. :D