Asus RT-AC87U bricked, pls assist any guru

Installing and Using OpenWrt
1

I apologize Openwrt users, but on Asus specific sites did not give me any working recommendations.
Please assist me any Guru to recover my router. Finaly after one month I received USB-UART cable. After all preparations I'm able via Putty connect by serial port to router.
If i press quickly ctrl-c able to enter cfe comman line or later if press enter to console command line. But how to recovery, what commands use for recover. I has read a lot of on openwrt and ddwrt forum but nothing assist me. .Please really need to recover, assist somebody. Unable to ping device from windows cmd. Before I'm trying firmware from openwrt and after come back to Asus-merlin firmware by using Asus restoration utility, process was successful,but after rebooting router bricked. Awaiting any info!!!

CFE version 6.37.14.86 (r456083) based on BBP 1.0.37 for BCM947XX (32bit,SP,)

uart0 NS16550 UART at 0x18000300
uart1 NS16550 UART at 0x18000400
nflash0 AMD NAND flash size 131072KB
nflash0.boot AMD NAND flash offset 0 size 512KB
nflash0.nvram AMD NAND flash offset 80000 size 1536KB
nflash0.trx AMD NAND flash offset 200000 size 1KB
nflash0.os AMD NAND flash offset 20001C size 129024KB
nflash1.boot AMD NAND flash offset 0 size 512KB
nflash1.nvram AMD NAND flash offset 80000 size 1536KB
nflash1.trx AMD NAND flash offset 200000 size 129024KB
eth0 Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller

cfe serial console available commands: nvram, reboot, flash, batch, go, boot, load, save, ping, arp, ifconfig, show, help

If will needs any additional info, pls tell me!

2

https://openwrt.org/toh/asus/rt-ac87u?datasrt=device%20techdata#debricking

3

The problem that router not going to rescue mode, that why asking how to recover from usb serial.
If try flash -noheader : flash1.trx router close tftp server in 1 sec and did not connect.

4 
Decompressing...done
Detect CPU turbo button...

CFE version 6.37.14.86 (r456083) based on BBP 1.0.37 for BCM947XX (32bit,SP,)
Build Date: 二  4月 22 16:05:16 CST 2014 (raymonddev@raymonddev-vm1210)
Copyright (C) 2000-2008 Broadcom Corporation.

Init Arena
Init Devs.
Boot partition size = 262144(0x40000)
DDR Clock: 800 MHz
Info: DDR frequency set from clkfreq=1000,*800*
et0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 6.37.14.86 (r456083)
CPU type 0x0: 1000MHz
Tot mem: 262144 KBytes

CFE mem:    0x00F00000 - 0x01795558 (9000280)
Data:       0x00F4DBB4 - 0x00F4E080 (1228)
BSS:        0x00F4E090 - 0x00F93558 (283848)
Heap:       0x00F93558 - 0x01793558 (8388608)
Stack:      0x01793558 - 0x01795558 (8192)
Text:       0x00F00000 - 0x00F4430C (279308)

Device eth0:  hwaddr 30-5A-3A-6D-4A-C8, ipaddr 192.168.1.1, mask 255.255.255.0
        gateway not set, nameserver not set
Startup canceled
CFE>
5 
CFE> flash -noheader : flash1.trx
Reading :: TFTP Server.
..tftp retry wait 0
Failed.: Timeout occured
*** command status = -21
6

https://wiki.openwrt.org/doc/techref/bootloader/cfe#tftp_client

Note:
check your tftp server (PC) firewall is disabled
check your PC has static IP e.g 192.168.1.2

7

Windows 7 pro, firewall disabled.
Ethernet card ip 192.168.1.2 ,mask 255.255.255.0 using tftpd64 soft
CFE> flash -noheader : flash1.trx
Reading :: TFTP Server.
..tftp retry wait 0
Failed.: Timeout occured
*** command status = -21

8

You started a tftp server here but didn't send any files from the client (PC) so it timed out.
In server mode you need to start sending the file (binary mode probably) before the server times out

9

Tftpd settings
tftp client inerface:
current directory where file location asus trx format file
server interface 192.168.1.2 assume PC ip
host 192.168.1.1 assume router ip
local file same like current directory asus trx file
command put in tftp client interface CFE> flash -noheader : flash1.trx
Reading :: TFTP Server.
..tftp retry wait 0
Failed.: Timeout occured
*** command status = -21
but the same

10

This means Tftpd is running as server on your PC

I don't have a CFE router to test but it looks like you have TWO tftp servers

the CFE flash command you are using is to start a tftp server on the router,

Try using the commands shown in this example but use the correct filenames
https://wiki.openwrt.org/doc/techref/bootloader/cfe#tftp_client

OR
use Tftpd in Client mode and retry your CFE flash command

Summary
You need ONE Server and ONE Client

11

Tftpd like server
flash -noheader 192.168.1.2:C:\Users\Fenix\Desktop\RT87U\RT-AC87U.trx flash
0.trx
Reading 192.168.1.2:C:\Users\Fenix\Desktop\RT87U\RT-AC87U.trx: TFTP Client.
Failed.: Timeout occured
*** command status = -21

12 
flash -noheader 192.168.1.2:RT-AC87U.trx flash

Just set the current director for Tftpd to be
C:\Users\Fenix\Desktop\RT87U

13

I'm curious can you run the CFE help command and post output

14

cfe serial console available commands: nvram, reboot, flash, batch, go, boot, load, save, ping, arp, ifconfig, show, help

15

The problem that I can not use cfe web interface because router going to cycle reboot

16

ifconfig command
Device eth0: ipaddr 192.168.1.1, mask 255.255.255.0 gateway not set, nameserver not set.
Could be here problem that not set, but i dont now how to set from cfe command line this items?

17

Trying with tfpt2 client but the same result
Reading 192.168.1.2:firmware.trx: TFTP Client.
Failed.: Timeout occured
*** command status = -21

18

Now you have two clients. Tftp2 is a client.

Use your previous flash command in this case.

Keep the filenames consistent.