@parthap this answer is perfect, thanks! If that Nano is sitting at the Nvidia logo, and you have indeed begin experimenting with various JetPack releases, including 4.6, then you have likely written your QSPI flash with a version that is not compatible with balena. (We are working on resolving that, however).
In the meantime, what you can do it this:
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On an Ubuntu PC, install the Nvidia SDK Manager, instructions for that are here: NVIDIA SDK Manager | NVIDIA Developer
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Connect your Jetson to the PC with a USB Cable, hooked up to the MicroSD port on the Nano.
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The SDK Manager will detect the Jetson, and you can overwrite it with a fresh installation of JetPack. In this case, select JetPack 4.4 or 4.5, and begin the flashing. (Fair warning, it takes a long time).
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Once that is finished, you have reverted your Nano back to the older 4.4 or 4.5.
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You can then boot your balenaOS SD Card, and the device should boot up and check in with balenaCloud.
Let me know how that goes, or if you run into issues. 