Xiaomi WiFi Router 3G V2

I have Xiaomi WiFi Router 3G V2. It has not usb port.
I really need OpenWRT for this but I don't know how to make a custom firmware....
Can anyone please help?
Thanks all
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Hi there,

open up the case, solder a serial pin header (2.51 pitch on 3G V1) and post the full bootlog of your device.

Probably it's almost the same as the first xiaomi wifi router 3g apart from missing usb, probably other nand flash and or dram chip...
If this is true you can first try to boot the initram image from version 1 per tftp without flashing anything and verify what works and what doesn't work.

Greets

How to get bootlog dispense use serial pin ?

Firstly you need a pin header like here:
https://openwrt.org/toh/xiaomi/mir3g#serial

Secondly you need a usb serial adapter with ttl logic like this:

And lastly a computer with usb and a serial terminal like putty:
https://putty.org/

Edit: Don't forget the cables to connect the two pin headers of your router and serial adapter.

Firstly you need a pin header like here:
https://openwrt.org/toh/xiaomi/mir3g#serial

I don't access this page

You can't access this page? Really?

This is the relevant picture

Just got the router as it was sold to me as a "3G".

Apparently Xiaomi did cut corners and this is a rebranded "4A Gigabit Edition" and there's some advanced discussion about it here: Xiaomi Mi Router 4A Gigabit Edition (R4AG/R4A Gigabit): fully supported but requires overwriting SPI flash with programmer So basically there's no openwrt yet.

The manufacture date on mine is "06.2019" so I assume it's unsafe to buy the 3G from china now. Be careful what you buy!

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