Sysupgrade fails on RB2011iLS


I'm trying to install OpenWRT on RB2011iLS.

I think I have the same problem then here :

But, I'm not sure of the issue. Is there another sysupgrade.bin file ?

Please, could someone can give a hand ?

Here is a post from the "port rb2011 to ath79" thread, where an up2date image is linked: [WIP] Porting Mikrotik RB2011 to ath79 - testers needed - #24 by g6094199

this is the build i'm using. not working.