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Author Topic: Bricked DSL 2750u USB to TTL help needed  (Read 1264 times)

jagmag

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Bricked DSL 2750u USB to TTL help needed
« on: May 26, 2018, 09:15:18 AM »

I have two dsl 2750u one is at my home and another one in my shop, i took backup file of one router (config.img) and tried to restore on 2nd router, after that my dsl 2750u got bricked.
no ethernet connection no wifi signal only leds are flashing, i tried different reset methods found on internet but no luck.
Finally i decided to fix it by USB TO TTL method and i connected router to pc by serial and setup everything , and opened putty,
It showed something like this
Code: [Select]
press 'esc' to enter boot console
 ext phy is not found
Copyright Realtek inc
When i pressed ESC key it showed like
<rtl867x>
So i tried entering "e nvram" , "erase nvram" , "nvram erase" but nothing happens.
I'm sure that when entering "reboot" and enter the router reboots
Please help me to erase nvram and fix the firmware
« Last Edit: May 26, 2018, 09:17:34 AM by jagmag »
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FurryNutz

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Re: Bricked DSL 2750u USB to TTL help needed
« Reply #1 on: May 26, 2018, 11:46:10 AM »

Not sure if this will help any:
Emergency Recovery Mode

If not, I recommend that you phone contact your regional D-Link support office and ask for help and information regarding this. We find that phone contact has better immediate results over using email.
Let us know how it goes please.
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jagmag

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Re: Bricked DSL 2750u USB to TTL help needed
« Reply #2 on: May 27, 2018, 07:40:33 AM »

Not sure if this will help any:
Emergency Recovery Mode

If not, I recommend that you phone contact your regional D-Link support office and ask for help and information regarding this. We find that phone contact has better immediate results over using email.
Let us know how it goes please.

Thanks for your reply, I've alreadt tried emergency recovery mode many times, nothing comes.
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jagmag

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Re: Bricked DSL 2750u USB to TTL help needed
« Reply #3 on: May 27, 2018, 07:48:29 AM »

Now i found that when pressing help brings help menu which includes
Code: [Select]
help
info
reboot
run [app addr] [entry addr]
r [addr]
w [addr] [val]
d [addr] <len>
mac ["clear"]/"osk"/mac address]
bootline
entry [address]
load [address]
xmodem [address]
tftp [ip] [server ip] [filename]
multicast
flashsize [256(k)/128(k)/1(M)/2(M)/4(M)/8(M)/16(M)]
memsize ROW
uart [enable] [disable]
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FurryNutz

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Re: Bricked DSL 2750u USB to TTL help needed
« Reply #4 on: June 22, 2018, 08:53:22 AM »

Any status on this?
 ???
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jagmag

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Re: Bricked DSL 2750u USB to TTL help needed
« Reply #5 on: June 22, 2018, 09:44:46 AM »

Gave it to D-Link service centre.
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FurryNutz

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Re: Bricked DSL 2750u USB to TTL help needed
« Reply #6 on: June 22, 2018, 09:58:57 AM »

Ok, hope it can be fixed or get replaced.

Good Luck.
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Cable:200mb/10Mb>NetGear C7800>DIR-882>DGS-1100>HP 24pt Gb Switch. COVR-3902/2202/1203,DIR-2680,890L,882,880L,868L,DNR-202L,DNS-345x2,DCS-933L,936L and 960L.
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