I tried to install (upload) the "openwrt-18.06.2-brcm63xx-smp-DGND3700v1-squashfs-factory.chk" to
my Netgear DGND3800B using the Netgear Web UI Firmware Upgrade option.....
unfortunately it did not work..... no valid Firmware File recognized message appears..
is there a different way to get openWrt installed on my Netgear?
I hoped I could take the good weather method to get openWrt installed
but yes I just soldered in a pin header, where RXD, TXD and GND for the TTL-com are located
.... I already ordered some TTL-UART---USB adaptors 2 weeks ago (for different purpose) but did not arrive yet.......
but at least.... when it arrive... "now" it's just plug and play (using jumper wires)