OpenWrt embedded multi 4G/WiFi and 5G router board


MediaTek MT7621A with 880 MHz dual-core (quad-thread) MIPS 1004Kc CPU


256 or 512 MB of DDR3


16, 32 or 64 MB of SPI NOR and optional second SPI NOR or SPI NAND flash


1× USB 2.0 Type-A

1× micro USB Type-B for system serial console access (driver free)


1× microSD (SDXC) flash card reader


5× Gigabit Ethernet with ESD protection


3× mini PCIe for 3/4G or WiFi module (PCIe ×1, USB 2.0, micro SIM, 3.3 + 5.0 V)

1× M.2/NGFF B-key 3042/3052 for 3/4/5G module (USB 3.0/2.0, mini + micro SIM)

1× mikroBUS™ socket (SPI and UART buses)

Pin headers

4× 8-pin + 1× 6-pin SIM card (2.54 mm pitch)

1× 4-pin I2C bus (2.54 mm pitch)

1× 4-pin system serial console (2.54 mm pitch)

2× 4-pin UART2/UART3 serial console (2.54 mm pitch)

2× 4-pin 3.3 and 5.0 V power supply (2.54 mm pitch)

1× 10-pin SPI flash programming (2.54 mm pitch)


3× push-button

1× power switch


1× power (green)

5× LAN/WAN (green)

3× mini PCIe (green)

1× M.2/NGFF (green)

1× status (green)                                    


RTC with CR2032 backup battery

External hardware watchdog


U-Boot with web-based firmware recovery and dual-image support

Officially supported in OpenWrt 19.07+ (Linux Kernel 4.14)

Power supply

DC jack (5.4/2.0 mm) with lock for 24 V DC input

Passive PoE input on LAN1 and optional 803.2af/at PoE module for WAN

Mounting holes

Φ3 mm, 200 × 123 mm


210 × 140 × 16 mm

Quad-E4G is a universal platform offering wide possibilities thanks to multiple expansion slots
Quad-E4G offers extensive expansion options and decent performance. Three mini PCIe slots with both PCIe and USB buses, equipped with SIM slots, allows assembling a wireless router with multiple WiFi or 4G modules.
An additional M.2 B-key slot makes it possible to create high-performance 4G/5G access point with LTE Cat. 6+. Five Gigabit Ethernet interfaces with hardware offload support will serve many end devices without the need to worry about throughput.
OpenWrt support and USB-based system serial console make development extremely easy.

Key features

1. MediaTek MT7621A (880 MHz dual-core MIPS)
    equipped with 256 or 512 MB of DDR3 RAM
2. 5× Gigabit Ethernet 2 with ESD protection
3. 3× mini PCIe (PCIe ×1, USB 2.0, micro SIM)
4. M.2/NGFF B-key (USB 3.0/2.0, mini + micro SIM)
5. 16/32/64 MB of SPI NOR flash
    (optional dual SPI NOR or SPI NOR + SPI NAND)
6. microSD (SDXC) flash card reader
7. RTC (I2C bus) with backup battery
8. 1× USB 2.0 Type-A
9. 1× micro USB Type-B for system serial console
10. 802.3at/af PoE support (optional module)