MobiPromo CM520-79F

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abgn+ac (AC1200)
wireless router
3rd Party Firmware
dd-wrt Status Unknown
OpenWrt Supported
Tomato any flavor Incompatible
Gargoyle Status Unknown
Platform
BrandModelRev MobiPromo CM520-79F
FCC ID (fcc.io) none specified
FCC ID (fcc.report) none specified
Type wireless router
CPU1 checkY Qualcomm IPQ4019
CPU1 Type ARMv7 Cortex-A7
CPU1 Speed 717 MHz ( 4 cores )
Flash1 Chip Brand? Model?
Flash1 Size 128 MiB 134,217,728 B <br />1,048,576 Kib <br />131,072 KiB <br />1,024 Mib <br />0.125 GiB <br /> (SLC NAND)
RAM1 Size 512 MiB 536,870,912 B <br />4,194,304 Kib <br />524,288 KiB <br />4,096 Mib <br />0.5 GiB <br />
RAM1 Chip Brand? Model?
ETH chip1 Qualcomm IPQ4019
Switch Qualcomm Atheros QCA8075
Ethernet Port Count 1-1GbE-WAN
2-1GbE-LAN
Wired Standard IEEE 802.3i/3u/3ab

802dot11 OUI: none specified

Stock bootloader U-Boot
Expansion IF types USB 3.0
USB ports 1
USB Hub Compatible Untested
Power 12 VDC, 2 A
Serial Port (UART) yes, 3.3V TTL, (115200 8N1)
Other
3rd Party Firmware Support OpenWrt • (List | Dev | DLs)
Retail
Availability End of Life
Radio 1
Chip1 Qualcomm IPQ4019
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 Qualcomm IPQ4019
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

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

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

Flashing

Flashing OpenWrt

Target: ipq40xx
Subtarget: generic
Package architecture: arm_cortex-a7_neon-vfpv4
Supported Since Commit
Support started version: 21.02.0
Current supported version: 24.10.4
LAN Hardware: Qualcomm Atheros QCA8075
LAN Comment: 2 non-detachable antennas
WLAN Hardware: Qualcomm Atheros IPQ4019
WLAN Comment: MIMO 2x2:2
Installation method(s):
see git-commit
git • >>
ipq40xx: add support for MobiPromo CM520-79F
MobiPromo CM520-79F is an AC1300 dual band router based on IPQ4019

Specification:

SoC/Wireless: QCA IPQ4019
RAM: 512MiB
Flash: 128MiB SLC NAND
Ethernet PHY: QCA8075
Ethernet ports: 1x WAN, 2x LAN
LEDs: 7 LEDs
      2 (USB, CAN) are GPIO
      other 5 (2.4G, 5G, LAN1, LAN2, WAN) are connected to a shift register
Button: Reset

Flash instruction:
Disassemble the router, connect UART pins like this:
 GND TX    RX
  [x x . . x .]
  [. . . . . .]

(QCA8075 and IPQ4019 below)
Baud-rate: 115200

Set up TFTP server: IP 192.168.1.188/24
Power on the router and interrupt the booting with UART console
env backup (in case you want to go back to stock and need it there):
	printenv
	(Copy the output to somewhere save)
Set bootenv:
	setenv set_ubi 'set mtdids nand0=nand0; set mtdparts mtdparts=nand0:0x7480000@0xb80000(fs); ubi part fs'
	setenv bootkernel 'ubi read 0x84000000 kernel; bootm 0x84000000#config@1'
	setenv cm520_boot 'run set_ubi; run bootkernel'
	setenv bootcmd 'run cm520_boot'
	setenv bootargs
	saveenv
Boot initramfs from TFTP:
	tftpboot openwrt-ipq40xx-generic-mobipromo_cm520-79f-initramfs-fit-zImage.itb
	bootm
After initramfs image is booted, backup rootfs partition in case of reverting to stock image
	cat /dev/mtd12 > /tmp/mtd12.bin
Then fetch it via SCP

Upload nand-factory.ubi to /tmp via SCP, then run
	mtd erase rootfs
	mtd write /tmp/*nand-factory.ubi rootfs
	reboot

To revert to stock image, restore default bootenv in uboot UART console
	setenv bootcmd 'bootipq'
	printenv
use the saved dump you did back when you installed OpenWrt to verify that
there are no other differences from back in the day.
	saveenv
upload the backed up mtd12.bin and run
	tftpboot mtd12.bin
	nand erase 0xb80000 0x7480000
	nand write 0x84000000 0xb80000 0x7480000
The BOOTCONFIG may have been configured to boot from alternate partition (rootfs_1) instead
In case of this, set it back to rootfs:
	cd /tmp
	cat /dev/mtd7 > mtd7.bin
	echo -ne '\x0b' | dd of=mtd7.bin conv=notrunc bs=1 count=1 seek=4
	for i in 28 48 68 108; do
		dd if=/dev/zero of=mtd7.bin conv=notrunc bs=1 count=1 seek=$i
	done
	mtd write mtd7.bin BOOTCONFIG
	mtd write mtd7.bin BOOTCONFIG1