I've installed "TP-LINK_lede-ar71xx-generic-tl-wr1043nd-v4-squashfs-factory.bin" using the stock firmware. No web-gui.
I uploaded "TP_link_lede-ar71xx-generic-tl-wr1043nd-v4-squashfs-sysupgrade.bin" (renamed to sysupgrade.bin) to the router using SSH and ran this command:
sysupgrade -v /tmp/sysupgrade.bin
Still no web-gui? 
I'm able to access the router using SSH.
What else to do?....I did reboot from command, it did reboot but still no LuCI.
Thanks in advance.
Luci is only available out of the box with the 17.01 release, which you can get here. If you want to stay on your current release, you can run -
opkg update
opkg install luci
Ahh....now I get it 
How can I tell if the sysupgrade was actually successfull?
I got this result from the sysupgrade command
root@LEDE:/# sysupgrade /tmp/sysupgrade.bin
Image metadata not found
Saving config files...
killall: watchdog: no process killed
Sending TERM to remaining processes ... dnsmasq sh ubusd askfirst logd netifd odhcpd ntpd
Sending KILL to remaining processes ... askfirst
Switching to ramdisk...
Performing system upgrade...
Unlocking firmware ...
Writing from <stdin> to firmware ...
Appending jffs2 data from /tmp/sysupgrade.tgz to firmware..
Upgrade completed
Rebooting system...
umount: can't unmount /dev/pts: Resource busy
umount: can't unmount /dev: Resource busy
The start-badge says the same after upgrade?:
BusyBox v1.26.2 () built-in shell (ash)
_________
/ /\ _ ___ ___ ___
/ LE / \ | | | __| \| __|
/ DE / \ | |__| _|| |) | _|
/________/ LE \ |____|___|___/|___| lede-project.org
\ \ DE /
\ LE \ / -----------------------------------------------------------
\ DE \ / Reboot (SNAPSHOT, r3220-12288d4)
\________\/ -----------------------------------------------------------Well, you got an "Upgrade Completed" message rather than a "Upgrade Successful" message, and if you look a few lines above you'll see Image metadata not found, so the flash didn't actually complete. You can flash again using the force option -F
sysupgrade -n -F /tmp/sysupgrade.bin
And it should look like this if successful -
Reboot (17.01.0-rc1, r3042-ec095b5)
Hmmm......still have some problems 
root@LEDE:~# sysupgrade -n -F /tmp/sysupgrade.bin
Image metadata not found
Invalid image type.
Image check 'platform_check_image' failed but --force given - will update anyway!
killall: watchdog: no process killed
Sending TERM to remaining processes ... dnsmasq sh ubusd askfirst logd rpcd netifd odhcpd uhttpd ntpd
Sending KILL to remaining processes ... askfirst
Switching to ramdisk...
Performing system upgrade...
Could not get image magic
Image check failed.
Upgrade completed
Rebooting system...
umount: can't unmount /dev/pts: Resource busy
umount: can't unmount /dev: Resource busy
umount: can't unmount /tmp: Resource busy
If I wanna to revert to the release version, should use the factory or sysupgrade image file?
I installed the sysupgrade release_RC1 from Luci....it seem to do the trick!
Thanks for the help 
You weren't using the factory images, were you?
For upgrades between LEDE (or OpenWrt) releases, only use the sysupgrade images if they are available. Factory images are built exclusively to be installed from non-OpenWrt (ideally vendor supplied) firmwares.
No, was using sysupgrade.
Will gladly connect a V4 to the internet and open up SSH on WAN for you guys to play with 
That's not very smart and safe.
Do yourself a favor and don't do this.