I flashed the openwrt image directly to a standard archer c20 v5 eu, as this is what I normally do on routers from other brands.
It bricked.
I then learned for these devices you have to add a bootloader to the openwrt image ...
When powering on the device holding the reset it boots for a few seconds to a fast green flickering.
I enabled TFTP server on OSX according to https://wrmem.net/index.php/2016/02/28/using-the-built-in-tftp-server-on-os-x-el-capitan/
I provided the Linaro1985 tp_recovery.bin
It seems to do nothing.
I disabled tftp, and downloaded both GUI, tftpserver and pumpkin.
Pumpkin tells me error 30 when trying to start the server, and fails to start tftp server.
tftpserver does not seem to start tftp, button stays red.
Are there any firewall settings on the mac?
What else can I try to habe my bricked Archer C20 v5 EU talk with my mac?
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probably, would you buy a product without one ?
I guess you're past the web recovery point https://openwrt.org/toh/tp-link/archer_c20_v5 ?
Sadly, yes. Without the reset button pressed it loops constant flickering all the lights.
Then you need to figure out why the TFTP isn't working for you.
Try to use Windows instead. Have you used tftp-server before?
Never used windows or tftp 
I know this is not openwrt stuff, how to get tftp working with routers on mac, but was hoping mac users here could help?
How stupid can one be ... Have 2 firewalls on mac, forgot to disable the silly built-in OSX firewall.
This device having only 8MB I can't get both openvpn and nano on the device. Could anyone tell me which packages I can remove from the list?
base-files busybox ca-bundle dnsmasq dropbear firewall4 fstools kmod-gpio-button-hotplug kmod-leds-gpio kmod-mt7603 kmod-mt76x0e kmod-nft-offload libc libgcc libustream-wolfssl logd mtd netifd nftables odhcp6c odhcpd-ipv6only opkg ppp ppp-mod-pppoe procd procd-seccomp procd-ujail swconfig uci uclient-fetch urandom-seed urngd wpad-basic-wolfssl
I am only using it for WAN, LAN, WiFi, openvpn, luci and nano to configure it all. Which packages are not useful/removable? Thanks!
ppp* if it isn't required by your ISP.