I tried through luci gui sysupgrade about week ago, accepted fine the file but it messed things up, login page at least broke down. Reverted back to this version and it was fine again.
I just took some time today and did a NAT performance tests, with and without SQM, IPv4 only. Below are the results from my test:
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May I ask how did you get the OpenWrt 22.03 branch?
Was it supposed to release for the public to download?
Unless you are 1 of the development team, I guess?
Alright thanks
Do you know if there is any changelog or a thread about snapshots?
You can check the git short log for the 22.03 branch at:
https://git.openwrt.org/?p=openwrt/openwrt.git;a=shortlog;h=refs/heads/openwrt-22.03
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BTW, this last commit should supposedly fix the Ethernet switch speed issue (all ports have the speed of the lowest speed connected port):
https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=f029912c07c177ae523c4b3ee86fbe4d3889788c
included in latest Snapshot or next one?
Next one (build date of April 19th or later).
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I can confirm latest Snapshot solved the 100Mbps ethernet upload bug! this router is great value for the money!
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If anyone wants to try pppoe hardware offload and wireless offload(only support firewall3) ，you can try this repository.
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In conclusion, only the modified mt76 package and patch are needed.
https://github.com/MeIsReallyBa/openwrt/blob/master/target/linux/mediatek/patches-5.10/999-fix-pppoe-flowoffload.patch
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Seems like this worked at the end. For some reason I needed to do the sysupgrade 2 times. After first time Luci web UI brokes down and after second I have 22.03 running succesfully and webUI works.
oh btw, I bought a third one today, the retailer I bought from got one returned from customer and lowered the price with €10, I asked them about production date and he answered the same as the two I bought before 09/2021, will use this one as backup as I gave one to my parents. 
This method looks very promising, however i have failed to get UART working.
I've an RB01 manufactured 11/2021 and telnet is closed. Connected a CP2102 USB-TTL to AX3200 UART, according the pinout find on OpenWRT TOH. Tried with putty 115200 baud, and got nothing but jibberish characters on console - after starting router with pressing RESET button for at least 5 seconds. Tried to swap RX and TX, but got nothing from the line. (Checked connection with multimeter continuity test, seems fine.)
Try with another USB-TTL, like CH341A!
I experienced the same with CP2102 + DWR-116 until changed my USB-TTL adapter to CH341A.
I'd like to thank you for your walk-trough. After failing to dump the flash from my telnet-disabled RB01 (made 11/2021) I was able to flash it using your method.
I used dnsmasq to provide both dhcp and tftp server (way easier).
One difference: On the MT7622> prompt I had to reissue a bootp command instead of tftpboot. The tftpboot was looking for the same miwifi___.bin I used in the beginning. bootp instead downloaded the new file that dnsmasq was serving.
Your method is a simple way to go for new routers. No soldering necessary and plausible deniability 
BTW: I am not sure why my CH341A could not dump the flash. I tried both flashrom and snander and both could not read the flash.
One more thing: To those wanting to solder, try to get a WSON8 adapter first. Failing that, the second socket next to the flash is wired 1:1 with the pins on the flash. It's way easier to solder on top of that pins than to try to get to the ones on the flash directly.
HTH
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Did you cut vcc?
That's interesting, tftpboot was all I used on AX6S/RB03. Maybe someone should run both the u-boot loaders through Diaphora or similar.
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