How to transfer an OpenWrt root file system to an external device?

Question

TP Link

Compiled OpenWRT firmware for tp Link mr3020
All installed packages
There was a problem when transferring files to an external drive, everything is as it says
These packages are installed:

kmod-usb-core block-mount kmod-fs-ext4

I do the steps described

mkdir -p /tmp/introot
mkdir -p /tmp/extroot
mount --bind / /tmp/introot
mount /dev/sda1 /tmp/extroot
tar -C /tmp/introot -cvf - . | tar -C /tmp/extroot -xf -
umount /tmp/introot
umount /tmp/extroot

At some points, he swears that there is no such partition, although they are present, he
checked
the USB drive is formatted

As a result, the files are not transferred to the USB flash drive, what could be the problem? Don't have the required package?

Answer 1

You most likely do not mount the flash drive, install the kmod-usb-storage package
and show the system log when the flash drive is connected