Installting OpenWrt on this vintage device was just a hobby. It's unfortunate however.
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The bootloop issue on that dinosaur router got revived with the image file openwrt-23.05.2-bcm63xx-smp-netgear_dgnd3700-v2-squashfs-cfe via recovery.- serial short-circuit
The official wiki false claims that 23.05.0 should work first try, and not second,etc, i did first try, and another 15 flash - installations of various openwrt versions and none worked, except the mentioned. maybe it has something to do with the driver versions bcm63xx-smp vs bmips-bcm6362 because the version the offical model finder page that provides for download is openwrt-23.05.0-bmips-bcm6362-netgear_dgnd3700-v2-squashfs-cfe.bin which will cause a bootloop, so maybe i is about bmips-bcm6362 vs bcm63xx-smp
Out of curiosity if the mentioned version unbricks it for any of you via the serial pin short-circuit method, let me know.. supposedly mine from what i read, should be dead forever after the first failed attempt (something like uboot paritition and cferam getting renamed after first flash?)
I don't have this device anymore. And as mentionned I just tried to install Openwrt as a hobby. I didn't expect much of that vintage device anyhow.