AR300m-ext uboot mess / brick?

Technical Support for Routers
1

Hi all,

I have an AR300M-ext that failed to boot from NOR with switch.
Sometimes I got it working but mostly via the bootcount.

Anyway I used the bin from: uboot-for-qca95xx/bin at 33dde1394a14df4e8686fe5d2e702203dfac0de9 · gl-inet/uboot-for-qca95xx · GitHub

and flashed it like described here(md5sum looked O.K.):

Via UART Serial I issued:
ath> run lu
Trying eth0
eth0 link down
FAIL
Trying eth1
enet1 port0 up
dup 1 speed 1000
Using eth1 device
TFTP from server 192.168.1.2; our IP address is 192.168.1.1
Filename ‘uboot-gl-ar300m.bin’.
Load address: 0x80060000
Loading: #############
done
Bytes transferred = 65679 (1008f hex)
Erasing flash…
First 0x0 last 0x4 sector size 0x10000
4
Erased 5 sectors
Copy to Flash… write addr: 9f000000
done�

Since this action the AR300M-ext is just lighting the three LEDs when you power it.

So something went terribly wrong.
Is there a JTAG where the broken Bootloader can be fixed?
Or another way to recover this?

Thanks in advance

Kai

2

Sorry no JTag.

If you brick the uboot you have to desolder the flash.

3

O.K. which chip to desolder (Picture) and what then to do with that chip?

4

I am also interested since I have the same problem with a destroyed uboot and all three leds on. I got exactly the same msg yesterday :roll_eyes:

I think the flash is on the backside with 2x4 contacts. Mine is from Winbond. There are adapters to flash it without having to desolder it. But I do not know how good they are and how to re-flash it.

5

Hi Oli,

me neither, I have now ordered a CH341A 24 25 Series EEPROM Flasher BIOS USB Programmer with a “Clip” at EBAY.
And already found:

So first step is read the broken flash