Xiaomi Mi WiFi Range Extender AC1200 (RA75)

multiple revisions of this device, use caution

abgn+ac (AC1200)
WiFi Range Extender AC1200
Homepage	Product page
3rd Party Firmware
dd-wrt	Status Unknown
OpenWrt	Supported
Tomato any flavor	Incompatible
Gargoyle	Status Unknown
Platform
Brand • Model • Rev	Xiaomi Mi WiFi Range Extender AC1200 (RA75)
FCC ID	2AFZZRA75
Type	range extender, repeater
CPU1 Y	MediaTek MT7628DAN
CPU1 Type	MIPS 24KEc
CPU1 Speed	575 MHz
Flash1 Chip	Winbond W25Q128BV
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	MediaTek MT7628DAN
ETH chip1	MediaTek MT7628DAN
Ethernet Port Count	1-100MbE-LAN
Wired Standard	IEEE 802.3i/3u
802dot11 OUI: none specified
Stock bootloader	U-Boot 1.1.3 Ralink U-Boot v4.3.0.0
Stock FW OS	Linux 3.10.14
Expansion IF types	none specified
Power	100-240 VAC ~ 50/60 Hz, 0.3 A
Connector type	AC (direct)
Serial Port (UART)	yes, 3.3V TTL, (115200 8N1)
Other
3rd Party Firmware Support	OpenWrt • (List | Dev | DLs)
Retail
FCC approval date	02 August 2021
Country of manuf	China
Radio 1
Chip1	MediaTek MT7628DAN
Wireless interface OUI	none specified
Antenna Connector Type	none specified
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	none specified
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 brand Radio1 chip1 brand Radio2 chip1 brand Xiaomi Mi WiFi Range Extender AC1200 (RA75) MediaTek MediaTek MediaTek Xiaomi Mi WiFi Range Extender Pro MediaTek MediaTek

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.

• 300 Mbps - 2SS 2.4GHz 802.11n (40MHz chan.),

• 867 Mbps - 2SS 5GHz 802.11ac (80MHz chan.) = AC1200 class

Links of Interest

• On the OpenWrt Wiki

M75 R0103 V1.1

Flashing

Flashing OpenWrt

On the OpenWrt ToH (techdata entry)
On the OpenWrt Wiki
On the OpenWrt Forum

Target: ramips
Subtarget: mt76x8
Package architecture: mipsel_24kc
Supported Since Commit
Support started version: 23.05.0
Current supported version: 25.12.2

LAN Hardware: MediaTek MT7628DAN
WLAN Hardware: MediaTek MT7628DAN, MediaTek MT7612EN
WLAN Comment: MIMO 2x2:2 for each band
Installation method(s):
U-Boot TFTP recovery
Install Comment:
No HTML UI, so OpenWrtInvasion does not work
Recovery method(s):
U-Boot TFTP recovery
Comment:
Works with Firmware for mi_router_4a_mir4a_100m, but ethernet will be WAN port and inaccessible

git • >>

ramips: add support for xiaomi RA75 Range Extender This device is a 'Range extender' variant of the Xiaomi 4A router. Its identical to the 100m non-intl/chinese version as much as it can run the same firmware, differences being form factor, LEDs, WPS button and one 100M port only. The stock firmware differs significantly, being 'app managed only'. Device specification -------------------- SoC: MT7628DAN MIPS_24KEc@580MHz 2.4G-n 2x2 WiFi: MT7612EN 5G-ac 80MHz 2T2R Flash: 16MB W25Q128BV DRAM: 64MB built-in SoC Switch: built-in SoC Ethernet: 1x10/100 Mbps USB: None Antennas: 2 x external, non-detachable LEDs: 2 programmable blue/amber Buttons: WPS and reset (hidden) Housing: Range Extender / Wall wart Serial: 115200,8n1 MAC Addresses ------------- All 3 MACs are read from flash and identical to stock. Label MAC is WIFI 2G Installation ------------ No HTML UI on this device, serial console only. The serial connector is unpopulated but standard size and clearly marked. Flash from the U-Boot shell at boot by choosing (2) and flashing the sysupgrade file via tftp. Recovery/Debricking procedures of the xiaomi 4A and variants should work, but there currently is no official source for the stock firmware.