I'm having problems upgrading my rev. D from 15.05.
Trying to write zImage from any later version gives the following error...
root@OpenWrt:/tmp# mtd write lede-17.01.6-ixp4xx-generic-zImage linux
Unlocking linux ...
Writing from lede-17.01.6-ixp4xx-generic-zImage to linux ... [e]Failed to erase block
root@OpenWrt:/tmp# mtd write openwrt-18.06.2-ixp4xx-generic-zImage linux
Unlocking linux ...
Writing from openwrt-18.06.2-ixp4xx-generic-zImage to linux ... [e]Failed to erase block
I was fortunate to be able to write 15.05 back ok...
root@OpenWrt:/tmp# mtd write openwrt-15.05-ixp4xx-generic-zImage linux
Unlocking linux ...
Writing from openwrt-15.05-ixp4xx-generic-zImage to linux ...
Any ideas?