Wifi Problem on Archer C7 V5

Previously I had build an 19.07 branch for Archer C7 v5 and wifi works fine.
As I needed to install kmod-usb-ohci, I decided to update the feeds and build openwrt again, but after installing the firmware on the router the 5ghz wifi stopped working.
I downloaded the snapshot image at https://downloads.openwrt.org/snapshots/targets/ar71xx/generic/openwrt-ar71xx-generic-archer-c7-v5-squashfs-sysupgrade.bin and i got the same error. At the moment I had to install version 18.06.4 for wifi to work again.
I wonder if there was a firmware change or is it a bug?

It's a firmware change. ar71xx hasn't been updated in a few months.

You should use the new ath79 firmware: https://downloads.openwrt.org/snapshots/targets/ath79/generic/openwrt-ath79-generic-tplink_archer-c7-v5-squashfs-sysupgrade.bin

(Backed up settings may not work between this version and 18.06.4.)

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Thanks for the answer.

I install the new ath79 firmware from openwrt site and wifi works.
After I clean the build system and compile all packages again, and works.

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