An installation of Android Marshmallow is now available for Nexus 9 LTE and WiFi models. This Marshmallow update version is a MRA58K build number and is compatible with Nexus 9 LTE and WiFi models. Flashing the firmware on any other device may damage or brick the device. Ensure you download the right custom ROM for your device and that data on your device is backed up.
Once you are done, Switch your Nexus 9 off and restart into the bootloader by long-pressing the Power and Volume Down simultaneously.
Plug the Nexus device into a computer using a USB cable.
Find the downloaded firmware/ custom ROM you saved in the folder for ADB Tools by simply launching the Windows Explorer.
Double tap the flash-all.bat file to begin the installation process.
When the process is over, the Nexus 9 will reboot and by this time it should have started running on Android Marshmallow.
NOTE: If you are stuck in the boot screen, you can easily resolve this problem. Return to the bootloader, wipe the cache partition using the Volume buttons to choose Recovery Mode and the Power key to confirm, after this reboot. Alternatively, select a factory reset or wipe data in the Recovery menu.
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