RPI-CM4 wifi client mode problem

With OpenWrt 21.02.1 on the Raspberry Pi CM4, You may have trouble connecting to the higher 5 GHz channels. For example, I was able to scan for and connect to an 802.11ac wireless network on channel 44 but not on channel 153. The logs were also flooded with daemon.warn wpa_supplicant[681]: wlan0: Failed to initiate sched scan.

Updating the firmware files in /lib/firmware/brcm/ fixed this problem for me. The latest firmware files can be downloaded from the linux-firmware repository:

That works for OpenWrt 21.02.1, but not working for OpenWrt 19.07. Is there any patches for OpenWrt 19.07 working for this? Thanks.