ASUS RT-AC58U v2

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AC1300 Dual Band WiFi Gigabit Router.
Support for this device is Work In Progress!

Links
wikidevi (source of some info on the page)	https://wikidevi.wi-cat.ru/ASUS_RT-AC58U_v2
GPL Source Code (select “Others” in “select OS” drop-down)	https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AC58U-V2/HelpDesk_Download/

Common information

This section describes information that is shared across the series of related devices.

Common Links
Forum thread	https://forum.openwrt.org/t/adding-openwrt-support-for-asus-rt-ac57u-v2/53281
WIP PR for qcn5502 (802.11n at 2.4GHz) Wi-Fi	https://github.com/openwrt/openwrt/pull/9389
FCC	https://fcc.io/MSQ/-RTACRH01
Similar or identical devices	series

Common specifications
SoC	Qualcomm QCN5502 WiSoC
CPU	MIPS 74Kc (v5.0) @775MHz
WLAN1	Qualcomm Atheros QCN5502 (bgn)
WLAN2	Qualcomm Atheros QCA9888 (an+ac, 2T2R, 5GHz)
RAM	128 MiB (Winbond W971GG6SB-25)
USB	one USB 2.0 port
Switch	Qualcomm Atheros QCA8337
Ethernet speed	1000Mbps
LAN ports	4
WAN ports	1

Serial: there are 4 connection points in the upper right corner of the board.

Left to right: power, ground, TX, RX. Check the labels near the holes. Baud-rate is 115200.

The router has 9 LEDs:

ssh access can be enabled on the router web admin page at this menu point: Administration → System → Service. You have full root access.

You can download the WIP source code and community images at https://gitlab.com/alexconst.sh/openwrt.

Building from source: branch apjet01-802.11n is probably what you want as it is the only one with qcn5502 support
Using unofficial images (NO WARRANTY! BACK UP YOUR FLASH!)
1. make sure your stock flash layout matches the table under the “Flash Layout” section below on this page (rootfs doesn't matter as long as it's contained inside “linux”)
2. checkout the apjet01-releases/v1 tag and look inside asus-apjet01-releases directory
3. select the file depending on the name (and version!) of your device
4. *squashfs-factory.bin is what you want for full initial install

In recovery mode, the bootloader will start a tftp server and wait for you to send the image.

Connect router's LAN port to your computer
Set static IP of computer to 192.168.1.10/24
Make sure the router is turned off
Hold the reset button
Turn the router on and keep holding the button a few seconds until you see the power LED blinking slowly
Use a tftp client to send the image file to IP 192.168.1.1 at port 69 (example with atftp: atftp --put -l /path/to/image 192.168.1.1 69)
If there are no errors from tftp client, bootloader is installing OpenWrt; wait 2-3 minutes
Remove static IP from your computer's network interface, switch back to DHCP

Another updated custom build, with package management working: https://github.com/looi/openwrt/releases/tag/qcn550x-tag

partition	start	end	Name
mtd0	0x000000000000	0x000000040000	Bootloader
mtd1	0x000000040000	0x000000050000	nvram
mtd2	0x000000050000	0x000000060000	Factory
mtd3	0x000000060000	0x000000f80000	linux
mtd4	0x0000001ecb00	0x000000f80000	rootfs
mtd5	0x000000f80000	0x000001000000	jffs2
mtd6	0x000000000000	0x000001000000	ALL

You can backup a partition like this:

Login via ssh, telnet or serial console
Use dd command to backup (Danger, wrong usage can overwrite rom): dd if=/dev/mtd6 of=all.img
Use scp to download the image