I compiled and sysupgraded the RE450v1 snapshot from git.
Something strange happened:
After flashing, modifications to /etc/conf/ are not saved (they seem to be saved when modifying in command line, but they are not saved to disc). After reboot, I am back to the original image like nothing was done. It seems that the filesystem is readonly.
Your image is too big and there's not enough space on the device to create a writeable overlay. So you can make changes to the running device but they'll be lost when you restart it.
and if all else fails you can write config file to boot image itself while build
files in <buildroot dir>/files/ will inclued in built image
so config your image in filst boot - backup config files - insert it in new image
I am really in favor of reusing old hardware in OpenWRT, to fight planned obsolescence. But in the case of the RE450v1, it does not seem to work in mesh mode, so it is not suitable to my needs. I will probably go for new hardware and buy a second GlibNet B1300.