Hello,
is there a way tp backup the system including all installed packages and config so i can "install/upload" this one file on uboot?
I might not have internet at the reinstalling spot so no way to download the before installed packages like "installed-list" i have read before.
depends on you router and the format of you partitions
but you can backup your firmware "kernal & rootfs etc"
but the way you restore this depends on you router
but it will return to the state of the backup