Xiaomi MiWiFi 3A (R3A)

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abgn+ac (AC1200)
Xiaomi MiWiFi 3A
Homepage Product page (CN)
WikiDevi.wi-cat.ru Xiaomi MiWiFi 3A
3rd Party Firmware
dd-wrt Status Unknown
OpenWrt Supported
Tomato any flavor Incompatible
Gargoyle Status Unknown
Platform
BrandModelRev Xiaomi MiWiFi 3 A (R3A)
FCC ID (fcc.io) none specified
FCC ID (fcc.report) none specified
Type wireless router
Series MiWiFi
CPU1 Question? MediaTek MT7628AN
CPU1 Type MIPS 24KEc
CPU1 Speed 580 MHz
Flash1 Chip Brand? Model?
Flash1 Size 16 MiB 16,777,216 B <br />131,072 Kib <br />16,384 KiB <br />128 Mib <br />0.0156 GiB <br />
RAM1 Size 64 MiB 67,108,864 B <br />524,288 Kib <br />65,536 KiB <br />512 Mib <br />0.0625 GiB <br />
RAM1 Chip Brand? Model?
ETH chip1 MediaTek MT7628AN
Switch MediaTek MT7628AN
Ethernet Port Count 1-100MbE-WAN
2-100MbE-LAN
Wired Standard IEEE 802.3i/3u

802dot11 OUI: none specified

Stock bootloader U-Boot
Stock FW OS Linux 3.10.14
Expansion IF types none specified
Power 12 VDC, 0.6 A
Connector type barrel
Serial Port (UART) yes, 4-pad header, J4, 3.3V TTL, (115200 8N1)
Other

Default SSID: Xiaomi_XXXX (19 addl. devices)
, Xiaomi_XXXX_5G (16 addl. devices)
Default IP address: 192.168.31.1
the IP 192.168.31.1 is used by 20 additional devices
of which 19 are Xiaomi devices

3rd Party Firmware Support OpenWrt • (List | Dev | DLs)
Retail
(Est.) release date 2017
Country of manuf China
Radio 1
Chip1 MediaTek MT7628AN
Wireless interface OUI none specified
Antenna Connector Type U.FL
MIMO status 2x2:2
Wireless Standard IEEE 802.11b/g/n
802.11n up to 300 Mbps
802.11g up to 54 Mbps
802.11b up to 11 Mbps
WiFi Operating Frequency 2.4 GHz
Radio 2
Chip1 MediaTek MT7612EN
Wireless interface OUI none specified
Antenna Connector Type U.FL
MIMO status 2x2:2
Wireless Standard IEEE 802.11a/n/ac
802.11ac up to 867 Mbps
802.11n up to 300 Mbps
802.11a up to 54 Mbps
WiFi Operating Frequency 5 GHz
 CPU1 brandRadio1 chip1 brandRadio2 chip1 brand
Xiaomi MiWiFi 3 (R3)MediaTekMediaTekMediaTek
Xiaomi MiWiFi 3 Pro (R3P)MediaTekMediaTekMediaTek
Xiaomi MiWiFi 3A (R3A)MediaTekMediaTekMediaTek
Xiaomi MiWiFi 3C (R3L)MediaTekMediaTek
Xiaomi MiWiFi HD (R3D)QualcommQualcomm AtherosQualcomm Atheros

For a list of all currently documented MediaTek chipsets with specifications, see MediaTek.

For a list of all currently documented Xiaomi devices with specifications, see Xiaomi.

867 Mbps - 2SS 5GHz 802.11ac (80MHz chan.),
300 Mbps - 2SS 2.4GHz 802.11n (40MHz chan.) = AC1200 class

Flashing

Flashing OpenWrt

Target: ramips
Subtarget: mt76x8
Package architecture: mipsel_24kc
Supported Since Commit
Support started version: 24.10.2
Current supported version: 25.12.2
LAN Hardware: MediaTek MT7628AN
WLAN Hardware: MediaTek MT7628AN, MediaTek MT7612EN
Installation method(s):
see git-commit
Recovery method(s):
see git-commit
git • >>
ramips: Add support for Xiaomi MiWiFi 3A
The Xiaomi MiWiFi 3A wireless router has a similar system architecture as the Xiaomi Mi 4A router, which is already officially supported by OpenWrt.

Product website: https://www.mi.com/miwifi3a

Device specification
--------------------
SoC:      MT7628AN MIPS_24KEc @ 580 MHz 2.4G-bgn 2x2
WiFi:     MT7612EN 5G-an, ac 80 MHz 2T2R
Flash:    16 MB
DRAM:     64 MB
Switch:   MT7628AN (integrated in SoC)
Ethernet: 1 x 10 /100 Mbps
USB:      None
Antennas: 2 x 2,4 GHz and 2 x 5 GHz (all are external and non-detachable)
LEDs:     blue/red/amber
Buttons:  Reset
Serial:   115200,8n1

MAC addresses as verified by OEM firmware:
------------------------------------------
use address source
LAN *:DD factory 0x28
WAN *:DD factory 0x28
2g *:DE factory 0x4
5g *:DF factory 0x8004

OEM firmware uses VLAN's to create the network interface for WAN and LAN.

Bootloader info:
----------------
The stock bootloader uses a "Dual ROM Partition System".
OS1 is a deep copy of OS2.
The bootloader starts OS2 by default.
To force start OS1 it is needed to set "flag_try_sys2_failed=1".

How to install:
---------------
1- Use OpenWRTInvasion to gain Telnet, SSH and FTP access: https://github.com/acecilia/OpenWRTInvasion
[IP: 192.168.31.1 | Username: root | Password: root | FTP-Port: 21]
2- Connect to router using telnet or ssh.
3- Backup all partitions. Use command "dd if=/dev/mtd0 of=/tmp/mtd0". Copy /tmp/mtd0 to computer using ftp.
4- Copy openwrt-ramips-mt76x8-xiaomi_miwifi-3a-squashfs-sysupgrade.bin to /tmp in router using ftp.
5- Enable UART access and change start image to OS1.

nvram set uart_en=1
nvram set flag_last_success=1
nvram set boot_wait=on
nvram set flag_try_sys2_failed=1
nvram commit

6- Erase OS1 & OS2 and install OpenWrt

mtd erase OS1
mtd erase OS2
mtd -r write /tmp/openwrt-ramips-mt76x8-xiaomi_miwifi-3a-squashfs-sysupgrade.bin OS1

See also

Models

XiaomiList of Xiaomi Wireless Devices
Xiaomi MiWiFi 3CMi Router 3C (R3L)
Mi Router 3G (R3G)Mi Router 3G v2 (R3GV2)
FCC ID: 2AIMRMIWIFIR3P • Mi Router Pro (R3P)
FCC ID: 2AIMRMIWIFIR3D • Mi Router HD (R3D)