How can I change extlinux.conf in uboot mode?

How can I change extlinux.conf file in uboot mode? For if I fogot to uncomment the backup choice in the extlinux.conf file, when the kernel and dts go wrong, the system can not boot up again.Then, the only choice is to flash the emmc again,it is not cool.

You pretty much cannot edit when in UBoot or CBoot (earlier releases used UBoot, more recent releases absorbed UBoot functionality into CBoot and UBoot was left out, but behavior is the same). About all you can do is clone, edit, and then restore with the clone. The newest of releases, L4T R35.x and R36.x developer preview, only work with newer models (35.x works with Xavier or Orin, 36.x works only with Orin), and these are improved and use UEFI, but these units still do not have complete boot parameter editing so far as I know.

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