FritzBox 7312 bricked, reflash via UART possible?

[debricker]

Hello,

saidly I failed the installation of openWRT via EVABootloader. While flashing a nettimeout happend. Afterwards the operation was frozen (at least seems so to me). Anyhow, this bricked the device.
At this point I thought the device is gone. However I found out that the device has a unpopulated UART interface. I also expect a 14 Pin JTAG on the backside of the PCB.

But first things first. I can read some startup messages via UART. It seems like the flash went well until a certain point, because the device at least knows something about AVM and openWRT but fails when decompressing.

ROM VER: 1.1.3
CFG 01
[/]
(AVM) EVA Revision: 1.1820 Version: 2820
(C) Copyright 2005 AVM Date: Jul 16 2013 Time: 15:30:34 (0) 3 0x90000909-0x9000BD1F

[FLASH:] MACRONIX Uniform-Flash 16MB 64 Bytes WriteBuffer
[FLASH:](Eraseregion [0] 128 sectors a 128kB)
[SYSTEM:] AR9 on 393MHz/393MHz/196MHz

Atheros 8030 detected

Eva_AVM >.

OpenWrt kernel loader for MIPS based SoC
Copyright (C) 2011 Gabor Juhos juhosg@openwrt.org
Looking for OpenWrt image... found at 0xb0031000
Decompressing kernel... failed, data error!

System halted!

The thing is I don't really know how to proceed. Can I simply flash the binary to the memory?

Thanks in advance!

[lleachii]

@debricker

Can I simply flash the binary to the memory?

Have you seen - https://openwrt.org/toh/avm/fritz.box.wlan.7330#ftp

[debricker]

Yes, but I can't access any web interface. My computer doesn't even show a wired connection, if I connect both via lan cable. I think the RJ45 port is not working unless the router finished booting, but I'm not sure tbh.

This means I can not establish a ftp connection anymore.

[lleachii]

@debricker

but I can't access any web interface.

Are you referring to the link I posted, or something else?

@debricker

My computer doesn't even show a wired connection, if I connect both via lan cable.

No connection, or no IP (two different things)?

You should expect the latter, as you bricked your device. If the former works, set a Static IP and proceeded with the WIki instructions.

[debricker]

Yes, I do refer to the links content.

This is what it looks like if I connect the router to my computer

user@PC:~$ nmcli device status
DEVICE                   TYPE      STATE                   CONNECTION 
wlx246511c0d8ab          wifi      verbunden               HomeZone    
lo                       loopback  connected (externally)  lo         
wlp12s0                  wifi      nicht verbunden         --         
p2p-dev-wlx246511c0d8ab  wifi-p2p  nicht verbunden         --         
enp0s25                  ethernet  nicht verfügbar         --         
cdc-wdm0                 gsm       nicht verfügbar         --         

And this, if I connect a functional 7312 (lucky me I have a second one) to the computer.

user@PC:~$ nmcli device status
DEVICE                   TYPE      STATE                                               CONNECTION         
wlx246511c0d8ab          wifi      verbunden                                           HomeZone            
lo                       loopback  connected (externally)                              lo                 
enp0s25                  ethernet  wird verbunden (IP-Einstellungen werden ermittelt)  Wired connection 1 
wlp12s0                  wifi      nicht verbunden                                     --                 
p2p-dev-wlx246511c0d8ab  wifi-p2p  nicht verbunden                                     --                 
cdc-wdm0                 gsm       nicht verfügbar                                     --   

Which IP would you recommend? 192.168.178.1 or openWRT emergency 169.254.1.1?

[lleachii]

@debricker

Yes, I do refer to the links content.

@debricker

I can't access any web interface

Please explain what web interface you're referring to?

The instructions I linked do not mention one.

@debricker

This is what it looks like if I connect the router to my computer

I'm not sure what your output means. Was it supposed to answer my question?

BTW, the output isn't in English.

@debricker

Which IP would you recommend? 192.168.178.1 or openWRT emergency 169.254.1.1?

You use the IP in the WIki. Did you review the FTP instructions I linked?

It seems you may be discussing something else - as the IP you're supposed to use is noted on the Wiki.

[lleachii]

@debricker

Wired connection 1

@lleachii

You need need to create a second NM profile with a Static IP in order to connect to the router!

Setting a Static IP on your PC is not an OpenWrt issue.

[debricker]

Sorry, I was just to stupid to establish a ftp connection to the fritzbox a second time. Worked fine, if I just redid the process (as you described...).
Reflashing was no problem and went very fast this time.

UART connection was not required, but interesting to watch the flashing process in parallel .