[LEDE-DEV] Archer c7 corrupted firmware bootloop - tftp aborting - serial not working

[QWeRKUS qwErkus]

Thank you for your replies. Turns out the problem was the ground
connection, and serial nowworks with pl2303. Unfortunately I mixed up
2 addresses when flashing the new firmware, and erased from 0x9f000000
on instead of 0x9f020000. As a result, my boot loader is corrupt. Now
I'm trying some last resort salvage over JTAG, using an rpi with
openocd as JTAG dongle. Assuming I manage to compile openocd with
ath79 support (which currently fails), can I use the u-boot from
pepe2k to restore my uboot ? I yes, how does it work: just copying the
bin to flash from 0x9f000000 onwards ?

Many thanks for your help, qwerkus

On Thu, Jun 1, 2017 at 11:52 AM, Tom Psyborg <pozega.tomislav at gmail.com> wrote:
> you should've flashed https://github.com/pepe2k/u-boot_mod as soon as you
> switched from stock to openwrt. uart is not that reliable. i've made similar
> mistake while testing TL-MR22U and got brick because of too little RAM. i
> had to open device and mess with flash chip.
>
> On 1 June 2017 at 11:33, Russell Senior <russell at personaltelco.net> wrote:
>>
>> >>>>> "QWeRKUS" == QWeRKUS qwErkus <qwerkus at gmail.com> writes:
>>
>> QWeRKUS> Hello, Something went wrong with my last flash of an archer c7
>> QWeRKUS> v2, and now the device refuses to boot. I'm trying to unbrick
>> QWeRKUS> it without success since.
>>
>> QWeRKUS> 2. I tried to get a serial access to the device, unfortunately
>> QWeRKUS> all I get is gibberish. Tried 115200 and 9600 baudrates, 8 bit,
>> QWeRKUS> no parity, 1 stop bit, no flow control with either CP2102 or
>> QWeRKUS> PL2303 usb uart dongles.  Also, I can't boot the device with
>> QWeRKUS> the ground wire from either uart plugged in. Lights turns on,
>> QWeRKUS> and just freeze.
>>
>> QWeRKUS> Wasted tons of hours on this, and would really be thankful for
>> QWeRKUS> any advice/pointers.
>>
>> Sounds like you are connecting your serial wrong.
>>
>>
>> --
>> Russell Senior, President
>> russell at personaltelco.net
>>
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>
>