I have the Asus RT-AC56U and I bricked the firmware update on one of tries to install the original firmware.
To fix it I connected my Windows 10 PC through a USB to TTL device on the GND, TX, RX.
Everything seemed to be working normally using PuTTY as a serial console, but I decided to install the OpenWRT firmware v19.07.7 and I got the output like this:
CFE> show devices
Device Name Description
------------------- ---------------------------------------------------------
uart0 NS16550 UART at 0x18000300
uart1 NS16550 UART at 0x18000400
nflash0 AMD NAND flash size 131072KB
nflash0.boot AMD NAND flash offset 00000000 size 512KB
nflash0.nvram AMD NAND flash offset 00080000 size 1536KB
nflash0.trx AMD NAND flash offset 00200000 size 1KB
nflash0.os AMD NAND flash offset 0020001C size 129024KB
nflash1.boot AMD NAND flash offset 00000000 size 512KB
nflash1.nvram AMD NAND flash offset 00080000 size 1536KB
nflash1.trx AMD NAND flash offset 00200000 size 30720KB
nflash1.brcmnand AMD NAND flash offset 02000000 size 98304KB
eth0 Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller
*** command status = 0
CFE> flash -noheader 192.168.1.10:openwrt-19.07.7-bcm53xx-asus-rt-ac56u-squashfs.trx nflash0
Reading 192.168.1.10:openwrt-19.07.7-bcm53xx-asus-rt-ac56u-squashfs.trx: TFTP Client.
- last blk -
Done. 7340032 bytes read
Download of 0x700000 bytes completed
Write kernel and filesystem binary to FLASH
Programming...copysize=7340032, amtcopy=7340032
done. 7340032 bytes written
I restarted the router by turning it off/on and now the router is not booting and I get nothing on the console.
Do you have any idea on what I can do to fix it?