OK, it must be a different version probably, but what about V3?
Mediatek MT7981BA, 128M Flash, 512 Ram
It is supportable...
There is already an open PR here.
I am alien to the pipeline procedure here. Is there anything that can be done to help the merge?
I don't have the hw yet, but I was planning to get one at least, if I knew this would happen.
For Mercusys MR80X v3, I closed the old PR, made some improvement, and made a new PR. It runs good on my device. Unfortunately, it lacks enough reviewers to merge into the main thread. If you are interested in this device, please feel free to leave a comment under the PR, and to discuss your problems.
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Looks good, how easy is it to open the casing to attach the UART?
Simply unscrew the back screw and pry open the cover. Four pins for UART are reserved on the circuit board, don't need other operations such as slodering registers.
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I tried it with my MR80x(BR) V4, and everything seems to be working fine. The PCB is different, but using the UART, the GPIO and hardware appeared to be the same, so I went ahead and flashed it. However, I'll wait for the change to be included in the 24.10 release before testing further.
Was it easy to flash?
Have you tried it again when 24.10 was released?
I'm almost buying it. It looks like to have even more RAM than Xiaomi AX3000T and it's even cheaper.
Will try the new release this weekend, so i can give a better response next week.
For the flash procedure i follow the same steps for the v3 and worked fine.
Looking forward for your feedback 
I actually found V3 being sold somewhere, I might try to get the v3 since it's the one in the PR.
But otherwise, let's say the seller is wrongly saying it's v3, it'd be good to know if it went fine for you. Can't live without OpenWRT in my wifi routers anymore.
What version is the one you bought? It looks like V3 is Mediatek, while yours is Qualcomm.
This one with Mediatek compared to Xiaomi AX3000T, this one seems to have double the RAM, the rest seems to be the same. So, would this be a better buy compared to the Xiaomi one?
Unfortunately in the country I'm, Xiaomi is a bit more pricey, and we also have the issue with different hardware in AX3000T.
Old AX3000T is MT too, new is QCA.
Yes, esp of you end up with the new 3000T.
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So I better hurry to get my hands in this MR80X v3
Thanks!
I installed version 24.10.2 on my MR80X v4 BR using the firmware intended for the MR80X v3 and tested the hardware to confirm that the configuration matches. Everything looks correct and has been working without issues so far. I’ve already integrated part of my network, but haven’t replaced the entire setup yet because I need to contact my ISP to switch their router to bridge mode. Unfortunately, I’ve encountered some resistance, and I plan to follow up next week, as I believe the issues are related to double NAT.
I’ve included some of the tests I ran in here. If you’d like me to try other configurations or provide additional logs, just let me know.
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Nice, thank you!
I just got one, but I could get a v3 instead.
I'm just having a hard time to pry open the cover. I have unscrew the 2 screws, but I can't see any place where I can pry the top cover without damaging it.
Any tips?
I pried it open section by section, inserting a shim to prevent each part from snapping back. Some areas were more difficult due to their proximity to the locking tabs that hold the casing together. In those cases, I tried to open nearby sections that were less resistant instead.
You can look at these images to see the spots that don’t have tabs.
Jesus, I thought it was gonna be easier. Unfortunately since I had to pry with a screwdriver, it left some war marks in the shell 
By the way, RX TX GND, where do I see this in the board? The only pins I see exposed are these ones:
And this is the full board:
To find the RX, TX, and GND pins, you might need to fully disassemble the board and check if there are any labeled pins elsewhere.
If they’re not labeled, you'll probably have to identify them yourself using a multimeter.
I recommend watching some videos on how to do this, they can really help if you're not familiar with the process. Like this one https://www.youtube.com/watch?v=01mw0oTHwxg