sysupgrade -k -b my-openwrt-backup.tar.gz command will create all those /etc/ files you have automatically, and you will not need to copy one by one. Check my advice here you mind find it useful to script and automate the whole process.
Regarding keeping the 4 cool in demanding situations. I use a Raspberry pi 4 on another project and we needed to overclock and push it very hard in long periods so we picked up one of these https://www.amazon.com/seeed-studio-Cooling-Raspberry-Support/dp/B07V7SS5BZ and it have proved to be very effective. You prob. not need to connect/install the fan, it is a little noisy and corny anyway.
Yes, I picked up a Noctua 5v fan also If people want to use the on board radio the cooler tower does not block the signal as the those large alu. cases mention above. If you do not plan on using it, they are also great.
Hello all ! Im New on openwrt for 2month on rpi4 . But i have some Big error on the New update of firmware :. When i flash with balena ( removed partition before on sdcard ) . I get the same config when i boot ????
Same drivers installed , same openvpn config .....
And no acces in ssh .
What ? Im trying now a full erase of m'y sdcard on debian its for 30min , and i retrying to flash with balena ...
You have this problème with the New release or its only me ?
After you write the image and mount the partition, do you see the old files or the new?
You can use DD to fill the SD with random bits on the whole surface and then write again the image.