Xiaomi MiWiFi 4Q (R4C)

multiple revisions of this device, use caution
bgn (N450)
	Xiaomi MiWiFi R4Q
WikiDevi.wi-cat.ru	Xiaomi MiWiFi 4Q
3rd Party Firmware
dd-wrt	Status Unknown
OpenWrt	Supported
Tomato any flavor	Incompatible
Gargoyle	Status Unknown
Platform
Brand • Model • Rev	Xiaomi MiWiFi 4 Q (R4C)
FCC ID	none specified
Type	wireless router
Series	MiWiFi
CPU1	Qualcomm Atheros QCA9561
CPU1 Type	MIPS 74Kc
CPU1 Speed	750 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 /> (SPI NOR)
RAM1 Size	64 MiB 67,108,864 B <br />524,288 Kib <br />65,536 KiB <br />512 Mib <br />0.0625 GiB <br /> (DDR2)
RAM1 Chip	Brand? Model?
ETH chip1	Qualcomm Atheros QCA9561
Switch	Qualcomm Atheros QCA9561
Ethernet Port Count	1-100MbE-WAN; 2-100MbE-LAN
Wired Standard	IEEE 802.3i/3u
	802dot11 OUI: none specified;
Stock bootloader	U-Boot
Expansion IF types	none specified
Power	5 VDC, 1 A
Connector type	barrel
Serial Port (UART)	yes, 3.3V TTL, (115200 8N1)
Other
	Default SSID: Xiaomi_XXXX (19 addl. devices);
3rd Party Firmware Support	OpenWrt • (List \| Dev \| DLs);
Retail
(Est.) release date	June 2018
Country of manuf	China
Radio 1
Chip1	Qualcomm Atheros QCA9561
Wireless interface OUI	none specified
Antenna Connector Type	U.FL
MIMO status	3x3:3
Wireless Standard	IEEE 802.11b/g/n
802.11n	up to 450 Mbps
802.11g	up to 54 Mbps
802.11b	up to 11 Mbps
WiFi Operating Frequency	2.4 GHz

For a list of all currently documented Qualcomm Atheros (QCA) chipsets with specifications, see Qualcomm Atheros.

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

• 450 Mbps - 3SS 2.4GHz 802.11n (40MHz chan.) = N450 class

Flashing

NOTE: During configuration or flashing a device, the only things that should be hooked to the device is the computer and power.

Flashing OpenWrt

This device is NOT RECOMMENDED for future use with OpenWrt due to low flash/ram.

DO NOT BUY DEVICES WITH 8MB FLASH / 64MB RAM if you intend to flash an up-to-date and secure OpenWrt version onto it! See 8/64 warning for details.

This device does not have sufficient resources (flash and/or RAM) to provide secure and reliable operation.

This means that you will not be able to install many packages, and that you might experience crashes due to OOM situations more or less often. See OpenWrt on 8/64 devices what you can do now.

On the OpenWrt ToH (techdata entry)

Target: ath79
Subtarget: generic
Package architecture: mips_24kc
Supported Since Commit
Support started version: 19.07.0
Current supported version: 25.12.0

LAN Hardware: Qualcomm Atheros QCA9561
WLAN Hardware: Qualcomm Atheros QCA9561
WLAN Comment: 3x3:3 MIMO
Installation method(s):
Sysupgrade, U-Boot TFTP + serial recovery, see git-commit

git • >>

ath79: add support for Xiaomi Mi Router 4Q
Hardware
--------
CPU:   Qualcomm Atheros QCA9561
RAM:   64M DDR2
FLASH: 16M SPI-NOR
ETH:   1x WAN - 2x LAN
WiFi:  QCA9561 3T3R
BTN:   1x Reset - 1x WPS
LED:   1x Blue - 1x Red - 1x Yellow
UART:  TX - GND - RX - VCC (From ethernet port)
       115200n8 - 3.3V

Installation
------------
1. Connect to the device via UART.

2. Interrupt the U-Boot on power-on by pressing enter when prompted.

3. Connect you computer to one of the routers LAN ports.
   Assign yourself the IP 192.168.31.10/24.
   Copy the OpenWRT initramfs image to a tftp server root directory.
   Rename the image to 'x4q.bin'.

4. Load the initramfs image to the router by executing following command
   in U-Boot. The image will boot afterwards.

   > tftpboot 0x81000000 x4q.bin; bootm

5. SCP the sysupgrade-image into '/tmp'.
   Remember to assign yourself an IP in 192.168.1.0/24 for this step!

6. Install OpenWRT permanently by executing

   > sysupgrade -n /tmp/<OpenWRT-sysupgrade-image>

Xiaomi MiWiFi 4Q (R4C)

Flashing

Flashing OpenWrt

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