I am can not update lede on raspberry pi 3?

please help me for update lede on raspberry pi 3 ?

[sajjad@sajjad ~]$ ssh root@     
The authenticity of host ' (' can't be established.
RSA key fingerprint is SHA256:ObxXAA6ikGeAllnxuY5QemqkXApHSILuaVOSh55+LG4.
RSA key fingerprint is MD5:6f:de:fe:a2:dd:9d:61:dc:cb:de:59:9c:e9:e4:db:ce.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '' (RSA) to the list of known hosts.
root@'s password: 

BusyBox v1.25.1 () built-in shell (ash)

    /        /\      _    ___ ___  ___
   /  LE    /  \    | |  | __|   \| __|
  /    DE  /    \   | |__| _|| |) | _|
 /________/  LE  \  |____|___|___/|___|                      lede-project.org
 \        \   DE /
  \    LE  \    /  -----------------------------------------------------------
   \  DE    \  /    Reboot (17.01.4, r3560-79f57e422d)
    \________\/    -----------------------------------------------------------

root@LEDE:~# opkg update
Downloading http://downloads.lede-project.org/releases/17.01.4/targets/brcm2708/bcm2710/packages/Packages.gz
Updated list of available packages in /var/opkg-lists/reboot_core
Downloading http://downloads.lede-project.org/releases/17.01.4/targets/brcm2708/bcm2710/packages/Packages.sig
Signature check passed.
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/base/Packages.gz
Updated list of available packages in /var/opkg-lists/reboot_base
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/base/Packages.sig
Signature check passed.
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/luci/Packages.gz
Updated list of available packages in /var/opkg-lists/reboot_luci
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/luci/Packages.sig
Signature check passed.
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/packages/Packages.gz
Updated list of available packages in /var/opkg-lists/reboot_packages
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/packages/Packages.sig
Signature check passed.
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/routing/Packages.gz
Updated list of available packages in /var/opkg-lists/reboot_routing
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/routing/Packages.sig
Signature check passed.
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/telephony/Packages.gz
Updated list of available packages in /var/opkg-lists/reboot_telephony
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/arm_cortex-a53_neon-vfpv4/telephony/Packages.sig
Signature check passed.
root@LEDE:~# ping
PING ( 56 data bytes
64 bytes from seq=0 ttl=46 time=116.690 ms
64 bytes from seq=1 ttl=46 time=112.996 ms
64 bytes from seq=2 ttl=46 time=154.319 ms
64 bytes from seq=3 ttl=46 time=114.737 ms
64 bytes from seq=4 ttl=46 time=124.107 ms
64 bytes from seq=5 ttl=46 time=132.796 ms
64 bytes from seq=6 ttl=46 time=114.766 ms
^X^Z[1]+  Stopped                    ping

There doesn't appear to be an actual problem based on your terminal output. LEDE 17.01.4 is the latest stable release build of LEDE.

All you have actually done there is updated the package list (a necessary first step). From there, you can install and upgrade packages as desired.

That said, it is possible to force-upgrade core packages within a stable release, but it is not recommended because it may cause instability and/or conflicts due to differences in the kernel versions and other dependencies if you do force upgrade.

You can upgrade to OpenWRT 18.06 snapshot, but that is only particularly useful if you want to be on the bleeding edge (i.e. okay with bugs, willing to update on a frequent basis, don't need to deal with many packages or are willing to build your own since the changes can cause the packages to be out-of-sync relative to the snapshot build, etc.). Snapshots are usually pretty good, but YMMV on any given one. BTW, in case you missed it, LEDE has remerged with OpenWRT, so the next release will be with OpenWRT branding.

For most users, it is typically easiest to wait until the next major stable release. Here's the timeline. This type of upgrade is not done via opkg -- on embedded memory devices, you'd use the flash upgrade (sys upgrade) process, but on an RPi with a memory card, you can just copy over a new image.