If you are using "librerouter os 1.5" you wont be able to safe upgrade properly to "librerouter os 2". You will have to fix boot parameters.
debuging
when upgrading art partition is ignored and wont be able to rise wireless interfaces. Also note that keeping config files maight not be possible.
If you just upgrade and the interfeces dont work using this command you can see that the kernel fails to load calibration data.
dmesg | grep -C 5 mac
ath9k 18100000.wmac: failed to load calibration data from mtd device