TP-Link Archer C20 v5 - Flashing OpenWRT Error code: 4503

Installing and Using OpenWrt
1

Hello,
got a TP-Link Archer C20 V5.
At Flashing got the Error code: 4503

openwrt-23.05.4-ramips-mt76x8-tplink_archer-c20-v5-initramfs-kernel.bin

grafik
grafik1260×228 15.3 KB

grafik
grafik770×216 5.54 KB

Do I need to Update the Original Firmware first ?
To: Archer C20(EU)_V5_221028

2

https://openwrt.org/toh/tp-link/archer_c20_v5

3

thanks I will try

4

There is just one try - OEM upgrade replaces installed bootloader and if it is not (any version of) OEM bootloader then all serial port recovery option is destroyed alongside.

5

@brada4

I bricked it - flashed by tftp the openwrt-23.05.4-ramips-mt76x8-tplink_archer-c20-v5-initramfs-kernel.bin

LED of LAN1 is blinking very fast
is connected to PC. But no static IP or DHCP is woking

Did solder pins and can connect with picocom
but the output is not good...
have a ch341a in Serial Mode /dev/ttyUSB0

picocom -b 115200 /dev/ttyUSB0

[�4000D07]�04000D08�
D�R Calibr�tion DQS�reg = 0000�88�

U-�oot 1.1.� (Nov 27 2�18 - 15:�1:04)

B�ard: Ralink APSoC�D�AM: 64 �B
rel�cate_cod� Pointer a�: 83fac000
gpi�둕1 5������.
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Any hints how to repair serial output ?

How to debrick the C20 ?

Conneted:

ch341           C20
GND    <->   GND
TXD     <->   TX
RXD     <->   RX

I checked the ch341 with another Device
there was the output GOOD

6

Try flow control and parity variations. Though might be hardware fault that serial clears a lot of bytes.

7

Wrong voltage?

8

image
image1490×309 24.2 KB

Did you go through this step?

9

@slh

voltage ? powersupply of the router ?

or did you mean the ch341 ?
could you explain more please ?

10

@erayrafet
no used frist time the off. openwrt image
and now looks like tftp install will no work again

11

You connect it like this:

RX - TX
TX - RX
GND - GND
VCC - VCC

12

It didn't have a bootloader without this step.

13

@erayrafet

thanks - ok thanks I will try

14

The voltage on the ch341 needs to match that of your router (in many cases 3.3V, but not always).

Vcc mustn't be connected (unless you know why you to need it), only gnd, rx and tx.

15

If I connect VCC did not get an Output

16
17

thanks

but hot to fix the bad output ?

18

As mentioned, you mustn't connect Vcc, you might have already killed the router (and/or damaged your USB port) by doing so.

1 Like
19

thanks the device runns now a old 19.07.10
but can not login by WebGUI

ssh is possibile with:

ssh -oHostKeyAlgorithms=+ssh-dss,ssh-rsa root@192.168.1.1

but scp did not work

scp -oHostKeyAlgorithms=+ssh-dss,ssh-rsa openwrt-23.05.4-ramips-mt76x8-tplink_archer-c20-v5-squashfs-sysupgrade.bin root@192.168.1.1:/tmp
root@192.168.1.1's password:
ash: /usr/libexec/sftp-server: not found
scp: Connection closed

How to get the openwrt-23.05.4-ramips-mt76x8-tplink_archer-c20-v5-squashfs-sysupgrade.bin to the device ?

can not scp user@mypc:~/Downloads/openwrt-23.05.4-ramips-mt76x8-tplink_archer-c20-v5-squashfs-sysupgrade.bin from openwrt

so at the moment I have no Idea how to flash the newer Image to the C20

20

use the -O switch to force scp to use the scp protocol.

1 Like