Here would be my build binaries, only additional thing I enabled is Luci with 2020 theme:
openwrt-ipq40xx-generic-netgear_wac510-squashfs-nand-sysupgrade.bin
openwrt-ipq40xx-generic-netgear_wac510-squashfs-nand-factory.ubi
openwrt-ipq40xx-generic-netgear_wac510-initramfs-fit-uImage.itb
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OK, if you have a patch I can directly integrate that in the PR. Thanks!
I've uploaded the .patch
https://drive.google.com/file/d/1xEdfeuqaeWYis8wDcLY7eJl1U_ZYQ52B/view?usp=sharing
Perfect, I applied it and re-building now. Thanks!
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I updated them binaries now as well should anybody else want to give it a try...
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Flashed your build now. So far so good.
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Can the factory image be flashed with the upgrade function of the original firmware?
To be honest, I never tried. So far I initially used the following installation method and then sysupgraded ever since:
Ok, I tried to flash the openwrt-ipq40xx-generic-netgear_wac510-squashfs-nand-factory.ubi via the web interface (original firmware) into a WAC505 - The original fw is always made for WAC510 and WAC505.
I put the root imgage into a tar archive with the following layout:
-rw-r--r-- root/root 14 2021-02-21 15:00 metadata.txt
-rw-r--r-- root/root 16 2021-02-21 15:00 version
-rw-r--r-- root/root 7864320 2021-02-18 17:32 wac5xx-ubifs-root.img
-rw-r--r-- root/root 56 2021-02-21 14:59 wac5xx-ubifs-root.md5sum
where metadata.txt is:
WAC505 WAC510
version (I choose the following):
WAC505_V9.9.9.9
the .md5sum file is the result of "md5sum wac5xx-ubifs-root.img > wac5xx-ubifs-root.md5sum"
The AP was accepting the layout and it seems flashing, but after 2 reboots it came back to the original firmware 
May be the WAC505 has some different layout (eg. it has only one LAN port).
Sadly, I have no serial access to see, what's going on.
It probably flashed, booted, failed, then booted to second partition which usually holds an older copy of the factory firmware.
I was told that you can only flash over a serial uart connection from factory.
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Just in case anyone else wants to use these things with VLANs, I'm using mine on tagged ports now, after following the guide I think @Gingernut tried to link to (this one).
Rebased @sumo's repo on master with no other patches. No issues with performance that I can see. Getting 300 something Mbit/sec with iperf3.
Speaking of your repo @sumo, did you get anywhere with creating a PR?
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No problems here to comment.
FWIW I have the lowest CPU frequency set @ 200Mhz as Qualcomm recommends and just recently enabled schedutil (replaces the old ondemand cpu governor), still testing but seems positive.
Schedutil needs enabling at compile time but here's what I stuff in my rc.local file:
# set CPU min freq scaling @ 200 MHz:
echo "200000" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
# switch the CPU scaling governor:
echo schedutil > /sys/devices/system/cpu/cpufreq/policy0/scaling_governor
No, sorry. But I hope to be able to really tackle it over easter.
I just tried installing OpenWrt from the original factory Netgear firmware V5.0.10.2 (01/08/2019) and it worked just fine. The only thing I noticed is that while the Netgear firmware does allow its web configurator via WAN PoE port, OpenWrt defaults to using it as an actual WAN port NOT allowing LuCI access so one has to revert to using the LAN port (defaults to regular 192.168.1.1/24) for LuCI access.
I re-based everything again and am now in the process of preparing the actual pull-request.
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Are you saying that you were able to flash from stock to OpenWRT using the factory.ubi image and directly from the Netgear webUI?
BTW anyone have any idea how to return to stock Netgear firmware from OpenWRT?
Yes, that is exactly what I'm saying.
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Well, so far I left an ancient Netgear installation on the backup partition of mine, so I was always able to go back by manually swapping primary/secondary as explained by others before.
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OK, I submitted my pull-request now. The commit message also contains all the collected lore plus whatever I validated concerning installation (from stock web UI or using TFTP) and dual image stuff. I also uploaded current images to my nextcloud for you to try (see Status of WAC510 port - #101 by sumo). Any feedback welcome. Thanks!
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