This problem is as old as mt76 driver; will not be fixed.
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Was not aware of that. Thanks for the heads up.
Will avoid MT7615N routers w/ OpenWrt combos in the future.
So I hesitated to press 'Force Upgrade' and [ Continue ]
on my Netgear WNDR3700v5 when I saw this scary warning:
Device wndr3700v5 not supported by this image Supported devices: netgear,wndr3700-v5 wndr3700v5 - Image version mismatch: image 1.1, device 1.0. Please wipe config during upgrade (force required) or reinstall. Reason: Config cannot be migrated from swconfig to DSA Image check failed.
The uploaded image file does not contain a supported format. Make sure that you choose the generic image format for your platform.
Force upgrade
Select 'Force upgrade' to flash the image even if the image format check fails. Use only if you are sure that the firmware is correct and meant for your device!
Am pretty sure that I have downloaded the correct image from here:
Can someone confirm that it is safe for me to proceed to force install this image?
thanks! 
p.s. current system status from Overview page:
Hostname
WNDR3700v5
Model
Netgear WNDR3700v5
Architecture
MediaTek MT7621 ver:1 eco:3
Firmware Version
OpenWrt 19.07.3 r11063-85e04e9f46 / LuCI openwrt-19.07 branch git-20.136.49537-fb2f363
Kernel Version
4.14.180
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same model + same revision + (same country) + sysupgrade = ok (with dont keep settings)
Thanks. I looked on the forums and there's a lot re: "mt76" drivers. Is there a fix or solution?
Well, installed DAWN + luci-app-dawn on both APs, got 802.11k enabled on top of 802.11r. Both DAWN instances are talking to each other and seeing each AP's respective SSIDs and connected clients.
Particularly there is one unique main/home SSID for both 2.4GHz and 5GHz radios on each AP. In that setup with all 4 radios on the same SSID, roaming is definitely improved, its now seamless with no reconnections and my 5GHz devices stay on the 5GHz band on that SSID. Love it!
What's concerning is that setting bss_transition 1 turns off and disables the radio where it was configured. People had this issue as far back as May 2020. ieee80211v 1 was removed by October 2020, leaving us with the 802.11v settings themselves to configure, so that commit didn't break anything.
Hmm, this is weird.
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@mercygroundabyss I'm aware of the NanoPi R4S, but it's not available where I live and it's difficult to source. There is definitely an appeal for two onboard gigabit NICs!
The Pi4, and LAN -> USB adapters on the other hand, are readily available.
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EDIT:
Turns out to enable 802.11v, you have to replace the included ath10k firmware with the full-htt version. Once that was done, setting bss_transition '1' doesn't permanently turn off the radio.
Didn't find this information anywhere, so I'm leaving this here for future reference.
got mine there. got the 4gb version with metal case.
NanoPi R4S (friendlyarm.com) also sell it if u in usa.
I've already added support for the devices and images have been available in the snapshot builds for some time now. I was asking about having the changes merged to the 21.02.0 branch!
yes, choose other platform, use OEM drivers (with limitations) or forget about stability.
Bro, at the RC4 I have same issuel at my MT7621
Was a little bit hesitant flashing to the newer version, but hey rc4 
, successfully flashed: Archer C7 v2 v19.07 -> 21.02 rc4, running wireguard, automigratition to the newer networkconfiguration went fluently. Keep up the good work!
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Another developer pushed a lot of awesome changes into DAWN:
I think the changes are very promising.
(They are not included in the current openwrt/master, 21.02.)
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fwiw, are you using the grey DSL socket on your HH5A?
If answer is No, you need to disable dsl_control to stop the random reboots.
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hi bill, thanks for the reply
yes I am using the grey DSL socket. It's in France, tbh it's been a disappointment, I was getting 98mb with the orange router and this one has gone down to 82mb so I might revert to the old router 
fwiw, if your ISP supports vectoring, try different Lantiq firmwares?
The firmware supplied for free by Lantiq, and distributed with LEDE/OpenWrt is over 4 years old and does not support vectoring as far as I'm aware.
I think there is another much longer thread on same subject, but I don't have a link for it.
Regarding the random reboots, have you tried a different power adapter?
Good luck.
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...and remember to enable software-flowoffloading for WAN speeds exceeding ~55 MBit/s on lantiq vr9 devices.
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well it came from the UK so I've got a uk to eu adaptor which isn't ideal but it wasn't doing this with rc3
it's a VDSL line and I checked that software flow offloading is enabled and so is the hardware one....
Actually I'm getting sick of the Frogs now so I might just go live in another country 
Cudy WR1300 just upgraded fine from RC3, no issues. Thanks guys!
Ok. Good job.
I don't know the policy about moving devices to mainstream. Maybe the dev team waits for more return of users' experience.
Does anyone have an estimate of when a stable version of 21.02 will be released?