Ok, the error
"Loading Environment from NAND... *** Warning - bad CRC, using default environment"
means that there is no uboot envs, which is correct after you first install (as you erased it)
Afterwards it is not correct as it means you did not save the env change
I can see here
GoFlexHome> setenv ethaddr 00:10:75:2d:b9:ec
GoFlexHome> setenv serverip '192.168.1.1'
GoFlexHome> setenv ipaddr '192.168.1.22'
**GoFlexHome> tftpboot openwrt-18.06.2-kirkwood-seagate_goflexhome-squashfs-factory.bin**
you did not write saveenv after the three setenv, as it is said in the article.
This means that the changes you made are lost on reboot.
The only thing you really need is the device mac address, but if you also save tftp settings you can use that as a recovery in the future.
You should connect serial again, get to uboot console and do
setenv serverip '192.168.1.1'
setenv ipaddr '192.168.1.22'
setenv ethaddr 00:10:75:2d:b9:ec
saveenv
After this you should not need to touch uboot again, no updates or anything, so you can disconnect the serial and close the device case.