Today I flashed OpenWRT 19.07.0 for the first time on my EX6150v2. Now the WiFi does not come up and in the log there are these entries:
Mon Jan 6 16:58:37 2020 daemon.notice netifd: radio0 (2424): command failed: Not supported (-95)
Mon Jan 6 16:58:37 2020 user.notice mac80211: Failed command: iw phy phy0 set distance 0
Mon Jan 6 16:58:38 2020 kern.warn kernel: [ 700.511714] ath10k_ahb a000000.wifi: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
Mon Jan 6 16:58:38 2020 kern.warn kernel: [ 700.511759] ath10k_ahb a000000.wifi: msdu-desc: 2500 skid: 32
Mon Jan 6 16:58:38 2020 kern.info kernel: [ 700.547516] ath10k_ahb a000000.wifi: wmi print 'P 48/48 V 16 K 144 PH 176 T 186 msdu-desc: 2500 sw-crypt: 0 ct-sta: 0'
Mon Jan 6 16:58:38 2020 kern.info kernel: [ 700.551163] ath10k_ahb a000000.wifi: wmi print 'free: 56528 iram: 23400 sram: 32520'
Mon Jan 6 16:58:39 2020 kern.warn kernel: [ 700.821456] ath10k_ahb a000000.wifi: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Mon Jan 6 16:58:39 2020 kern.info kernel: [ 700.821681] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready