We have just released High-Efficiency Firmware for AvalonMiner 8 series. The High-Efficiency firmware can reduce 20% – 30% of power consumption, but it will also reduce about 30% of Hashrate.
Every model has different firmware for the machine itself and the controller&Raspberry Pi, you can find the download links :
Controller(Raspberry Pi 3B): https://canaan.io/downloads/software/avalon821/openwrt/20181223/rpi3-modelb/openwrt-brcm2708-bcm2710-rpi-3-ext4-sdcard.img
Controller(Raspberry Pi 3B): https://canaan.io/downloads/software/avalon841/openwrt/20181223/rpi3-modelb/openwrt-brcm2708-bcm2710-rpi-3-ext4-sdcard.img
Controller(Raspberry Pi 3B): https://canaan.io/downloads/software/avalon851/openwrt/20181223/rpi3-modelb/openwrt-brcm2708-bcm2710-rpi-3-ext4-sdcard.img
If you have any question about that, please send an email to firstname.lastname@example.org