While encounter not able to run lru in Ubuntu system with lwb* series, what may need to check first?

Sterling-LWB5Sterling-LWB5+

Answer

1. Make sure to install proper MFG package (the same version or compatible version with the backports) and the lru binary fit to your platform.

You can check by "file /usr/bin/lru" to know what MFG binary you install.

2. Make sure all lib issues has been resolved.
3. Only run one Wi-Fi module in the system

Disable other modules by /etc/modprobe.d/blacklist.conf

4. Make sure lru run with the LWB5+ interface
5. killall wpa_supplicant and NetworkManager
6. Make sure firmware is loaded by MFG firmware, check if firmware is (CY WLTEST) in dmesg

/lib/firmware/brcm/brcmfmac4373.bin -> brcmfmac4373-usb-sa-mfg.bin

"ln -s /lib/firmware/brcm/brcmfmac4373-usb-sa-mfg.bin /lib/firmware/brcm/brcmfmac4373.bin"

7. lru need to root access right, so may need to run "sudo lru"