The factory firmwae version number 2.30.20 is also important and significant.
V2 uses 2.30.20 only, cannot downgrade to 2.28.xx. and V1 cannot upgrade to 2.30.20.
Put that in plain English, I'm not familiar with the Xiaomi device(s) ... 
I mean to confirm a R4A router is V2, using the firmware number 2.30.20 should be easy than checking the host name for the DHCP lease.
updated warning,
thnx
i bought this device last week in china, the packaging box says "r4a", but once plug in my router, device name is "r4av2". tried OpenWRTInvasion but ssh not work. i returned it just now.
any other device recommend？
For such low-end router, many choices, get a second hand device if you donot care.
hello! I managed to get telnet access to R4AV2 without a chip programmer (it lacks dropbear in the firmware)
Here's a link to my GitHub comment: https://github.com/acecilia/OpenWRTInvasion/issues/141#issuecomment-1296033775
There is no automated script to install, just the technical details. But it should be easy to wrap it in a script.
It is reported that RB02 firmware is supported by R4AV2 (everything works except the LEDs)
I used the 4pda thread as a reference. It was not working initially, but I adjusted it so that it works. Thank you.
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before buying from outside the box how to check if it's v2?
same questions, has you found any method,? how to check v2 or openwrt supported mi4a router.
There is no method to check from outside the box. I just checked the manufacture date if its old then its older version
like this? which manufacturig date for V1. some people selling this router on fb. date should 2020? or 2021?
if someone selling it online like box opened (second hand? how can we confirm from them like using 192.168.1.1?
" Xiaomi is currently shipping v2 of the 4A Gigabit Edition, it's identifiable by fw version 2.30.20, and the name when assigned an IP from a DHCP (not your ISPs) via the WAN port, MiWiFi-R4AV2. This model cannot be flashed with Openwrt"
I think 2021 is V1 version.
ok bro, let me find 2021 date model 
production date on box is: 10/2020
Should I buy it? for openwrt, MI 4A gigabit
The older, the bigger chance it not being V2.
Pretty sure V2 is flashable too though.
Gentlemen.
I recently receive an unit, a brand new R4A that I suppose to be R2, but some ever newer than any other... There is ver 0103 and the date 20211216 on the PCB. The IC´s placement is different from all photos I already saw on internet.
The main processor is the same MT7621AT, but no one method to exploit was effective... It is safer than the Fort Knox... It came with firmware 2.30.280 in Chinese. I tryed to burn the flah directly with the image https://downloads.openwrt.org/snapshots/targets/ramips/mt7621/openwrt-ramips-mt7621-xiaomi_mi-router-4a-gigabit-v2-squashfs-sysupgrade.bin (I have a flash burner) but the routter does not boot with it, nor with any other Xiaomi 4A image.
I tryed also to flash with other official firmware versions. Router won´t boot with other versions also.
It looks this nice piece is condemned to be used with the original firmware then...
If any of you have any thoughts on what can be done, I am open to suggestions.
Best regards.
Daniel.
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