Cannot downgrade L4T using OTA Update method

Hello,

I upgraded my Jetson Nano from 32.3.1 to 32.5.2 following the steps under Updating from the NVIDIA APT Server in the OTA docs

I now want to downgrade to 32.5.1. But the manual package installation fails, possibly because a downgrade of the bootloader is not supported. Is there a way around this?

3448-300-0002--1--jetson-nano-devkit-emmc-mmcblk0p1
Starting bootloader post-install procedure.
ERROR. Procedure for bootloader update FAILED.
Cannot install package. Exiting...
dpkg: error processing package nvidia-l4t-bootloader (--install):
installed nvidia-l4t-bootloader package post-installation script subprocess returned error exit status 1

Thanks,
Sanjay

hello SanjayD,

may I know the actual use-case to downgrade the version, is it only downgrade the bootloader?

Hi Jerry,

Part of our tele-op stack (provided by a 3rd party) is supported only up to 4.5.1. Also, it is possible that in the future we might find incompatibilities in a newer L4T and might need to downgrade our fleet after an update.

-Sanjay

hello SanjayD,

sorry, it currently support upgrade only.
there’s A/B redundancy to protect update failure with unexpected scenario (i.e. power shortage), this especially important to protect the bootloader.

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