Luma Home WiFi support

Hi all.
First off: drandyhaas, tmn505 and everyone. Thank you so much for all your efforts here. I have 4 luma units and can't wait to get them upgraded.
Which brings me to my question:
I'm following the instructions here https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=e24635710c7e6444afa463c59f3d81fe634eb3c7 to upgrade.
But after booting the initramfs image,
the next 2 commands file b/c it can't find fw_setenv
Any suggestion on how I can get past this?

thank you!