I'm trying to install on a Swisscom "Centro Grande" router. It's an ADB 4202N Pirelli AV 4202N
Following instructions from that page : wiki.openwrt.org/toh/adb/p.dg_av4202
I'm getting to the firmware update webinterface and try to upload the firmware :
openwrt-brcm63xx-generic-96368MVWG-generic-squashfs-cfe.bin
Then get the message : "image uploading failed. The selected file contains an illegal image."
Please advise.