Upgrading from v15 to v18 failing on Mikrotik Routerboard RB951Ui-2HnD - image file not supported

[Sopalajo]

OpenWRT v15 has worked fine for years on multiple Mikrotik Routerboard RB951Ui-2HnD I have.
Now I am trying to update to v18, so I kept this instructions:

[https://openwrt.org/docs/guide-user/installation/generic.sysupgrade](http://)

But the installation fails via LuCI:

OpenWRT the uploaded image file does not contain a supported format. mmake sure you choose the generic image format for your platform.

And it fails too via remote SSH console:

root@OpenWrt:/tmp# ls -la open*
-rw-r--r--    1 root     root       4085760 Aug 18 12:15 openwrt-18.06.4-ar71xx-mikrotik-nand-large-squashfs-sysupgrade.bin
root@OpenWrt:/tmp# sysupgrade -n openwrt-18.06.4-ar71xx-mikrotik-nand-large-squashf
s-sysupgrade.bin
Sysupgrade is not yet supported on rb-951ui-2hnd.
Image check 'platform_check_image' failed.
root@OpenWrt:/tmp# sysupgrade -n openwrt-18.06.4-ar71xx-mikrotik-nand-large-squashf
s-sysupgrade.bin -f
Sysupgrade is not yet supported on rb-951ui-2hnd.
Image check 'platform_check_image' failed.

	I performed the download from here:

https://openwrt.org/toh/views/toh_fwdownload?dataflt%5BBrand*~%5D=mikrotik&datasrt=model&dataflt%5BModel*~%5D=Rb951

Could anyone give me some help, please?

[subixonfire]

https://openwrt.org/toh/mikrotik/common

Upgrade using tftp metod described here.

[Sopalajo]

Thanks you, subix.
I have actually tested your method flashing OpenWRT v18 from a brand RouterOS, and it worked all right.
I will post when I will test the upgrading from v15 way.

[jasond]

Make sure you don't save the settings. When making such a large jump in versions the config has really changed so be sure to reprogram from scratch.

[Sopalajo]

Tested this method for updating v15 (actually new install) via the TFTP boot to v18.
Working OK.

Thanks you.

[Sopalajo]

Unchecking the "Keep settings" box yields the same error message, jasond .

And yes, I have performed new installation, without saving settings.
Thanks you.

The lesson here: updating form v15 to v18 does not allow to keep configuration.