Fantastic. So booted using initramfs and then did a sysupgrade from the shell. All using the custom images from wopo @ https://github.com/ThranduilII/openwrt/files/11399622/Openwrt-22.03.5-X5000R-Zbit-support.zip
Keep in mind that you won't be able to use any regular images until support for your memory chip reaches openwrt proper.
Pleased it's sorted 
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Thanks! 