Some users have encountered this error after downgrading. I want to know which version is better. I will be using this tool: xmir-patcher.
AX3000t EU and RD23 models
After? Or during downgrading?
Anyway, besides this UI method (which doesn't seem to work anymore since 1.0.9x), there are 2 more ways to downgrade stock firmware on RD23: use either the TFTP method or the Xiaomi MiWiFi Repair Tool.
It doesn't really matter- any version that lets you install OpenWrt is fine. If you want the safest choice, pick the 1.0.76 (INT).
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I couldn't fully understand how the TFTP method works, but I can do it using the Xiaomi MiWiFi Repair Tool. If you have some free time, could you please explain the TFTP method to me? I’ve read about it, but I didn’t quite get it.
The Xiaomi MiWiFi Repair Tool basically uses the TFTP method under the hood, but it also changes some network settings. That extra behavior is likely why some antiviruses flag it as suspicious app (though there's no 100% proof it really virus-free app).
The TFTP method is a series of steps where the device tries to download the firmware, and I'm not sure how to explain it better than the steps described in the wiki. As a TFTP server on a Windows PC, you can use tftpd64.464.zip app.
The simplified steps for Windows PC will be something like: set a static IP on your PC, e.g. 192.168.31.100; connect the router to your PC via Ethernet cable; run the tftpd64 app (make sure you put correctly renamed stock firmware file in the same folder as tftpd64.exe) and select 192.168.31.100 in tftp64 app; put the router into special mode (unplug the power, press and hold the reset button, plug the power back while still holding the reset button); release the reset router button when the firmware starts uploading to the router (you can see this in the tftpd64 app), and wait until a rapid blinking blue led light appears on the router. Then, reboot the router by turning the power off and on.
It's actually easier than it sounds 
, read wiki information notes marked with "i" on the gray background in the tftp section, it really useful.
Try, and if it works for you, you can consider to write a great guide for others with simple steps based on your experience.
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Let me explain, because my antivirus and browser blocked the download. VirusTotal shows that 40 out of 67 security vendors flagged this file as malicious. It would be best to use this tool, but the download link you provided isn’t working
It seems the official Bitbacket of tftpd64 app has been removed, but this git page still works: https://pjo2.github.io/tftpd64/ (though it doesn’t have any downloadable release files).
Too bad, bunch of places still link to this open-source app's Bitbucket page.
Anyway, feel free to find and download tftpd64 elsewhere (e.g. from this git fork which includes the "tftpd64-x64-v4.64.zip" file).
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There's no better if you only own one of them, use the files/firmwares for the hw you actually own.
You'd probably get better responses if you made a new thread for your separate band steering inquiry.
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@Fly2 , please find the instructions for using the TFTP method on Windows with the Xiaomi AX3000T router I added recently (click the "Windows" tab to see details about the tftp64 configuration):