[LEDE-DEV] sysupgrade with URL did not work

[Dennis Schneck]

Hello,
i tryed to Upgrade my C7 V2 with the sysupgrade command.
 
https did not work:
 
root at lede:~# sysupgrade https://downloads.lede-project.org/snapshots/targets/ar71xx/generic/lede-ar71xx-generic-archer-c7-v2-squashfs-sysupgrade.bin
Invalid image type.
Image check 'platform_check_image' failed.
 
http looks likt it work, but after reboot it was the old version.
 

root at lede:/tmp# sysupgrade http://downloads.lede-project.org/snapshots/targets/ar71xx/generic/lede-ar71xx-generic-archer-c7-v2-squashfs-sysupgrade.bin
 
 
If download the Image: lede-ar71xx-generic-archer-c7-v2-squashfs-sysupgrade.bin  and using luci it works wit the Upgrade.
OK luci i have to reinstall.

What did i wrong ?

Thanks
Dennis