VTH 5221D

[sag]

Dear All

I have bricked by dahua VTH5221D intercom monitor and now its keep restarting after I tried flashing it . Can anyone please help me figure out how to unbrick it ?

I am completely new to this . Please advise how can I connect with the device serial port ? what connections I need to make ?.

Also you please tell what are these two ports ? ?

Picture attached

 

[riogrande75]

There is a nice thread for this: Dahua easy unbricking
Read the 1st post carefully (twice). Then you should be able to get your VTH up again.

 

[sag]

There is a nice thread for this: Dahua easy unbricking
Read the 1st post carefully (twice). Then you should be able to get your VTH up again.

Thanks ..

Can you kindly explain which one is serial port and what pins are TX,RX,GRD ..

This is VTH 5221D, Dahua Intercom.

Thanks

 

[riogrande75]

UART VTH5221D

Take an old fw like this one: General_VTH52X1D_Eng_P_V1.000.0000.0.R.20170410 and don't touch the bootloader!!!

Use this commands.txt

tftp 0x82000000 romfs-x.cramfs.img; flwrite
tftp 0x82000000 user-x.cramfs.img; flwrite
tftp 0x82000000 data-x.cramfs.img; flwrite
tftp 0x82000000 gui-x.cramfs.img; flwrite
tftp 0x82000000 kernel-x.cramfs.img; flwrite
tftp 0x82000000 pd-x.cramfs.img; flwrite
tftp 0x82000000 .FLASHING_DONE_STOP_TFTP_NOW
sleep 5

After successful bootup you can upgrade it the official way.

 

[sag]

UART VTH5221D

Take an old fw like this one: General_VTH52X1D_Eng_P_V1.000.0000.0.R.20170410 and don't touch the bootloader!!!

Use this commands.txt

tftp 0x82000000 romfs-x.cramfs.img; flwrite
tftp 0x82000000 user-x.cramfs.img; flwrite
tftp 0x82000000 data-x.cramfs.img; flwrite
tftp 0x82000000 gui-x.cramfs.img; flwrite
tftp 0x82000000 kernel-x.cramfs.img; flwrite
tftp 0x82000000 pd-x.cramfs.img; flwrite
tftp 0x82000000 .FLASHING_DONE_STOP_TFTP_NOW
sleep 5

After successful bootup you can upgrade it the official way.

I was able to find serial port with your help but after sucessful flashing I get stuck again...I am using the same Firmware as you advise.
after flashing VTH doesnt boot at all, or the screen is completely dark. No display
.
I have attached putty log file with this post. Please advise. Thank you again.

 

[sag]

I made a mistake .. I flashed dm365_ubl_boot_16M.bin.img and now I am stuck . Please help . Is there anything we can do ?

DHBOOT# saveenv
Saving Environment to SPI Flash...
Environment SPI flash not initialized
DHBOOT#

[SERIAL/DIRECT] CONNECTED TO PORT COM3 (115200-8N1)


Checking DDR......OK

UBL Version: 1.46t(DM365)09:30:17 Sep 2 2014
Oscillator: 24MHZ
ARM Rate: 432 MHZ
DDR Rate: 340 MHZ
BootMode: SPI
Starting SPI Memory Copy...
DONE


U-Boot 1.3.6 (jerry) (Mar 28 2017 - 19:34:15)

DRAM: 128 MB
SF: Got idcode ef 40 19 00 00
SF: Unsupported Winbond ID 4019
*** Warning - probe error, using default environment

*** Warning - bad CRC, using default environment

In: serial
Out: serial
Err: serial
Ethernet PHY: GENERIC @ 0x01,id:1cc816
total gio 2
gio[22]=1
gio[25]=1
TFTP from server 192.168.254.254; our IP address is 192.168.1.108; sending through gateway 192.168.1.1
Filename 'upgrade_info_7db780a713a4.txt'.
Load address: 0x80100000
Loading: *
Retry count exceeded; starting again
Fail to get info file!
Init error!
TFTP from server 192.168.254.254; our IP address is 192.168.1.108; sending through gateway 192.168.1.1
Filename 'failed.txt'.
Load address: 0x80200000
Loading: *
Retry count exceeded; starting again
==>use default images
Environment SPI flash not initialized
Error when Got kernel from SPI flash!
Environment SPI flash not initialized
Error when Got kernel from SPI flash!
DHBOOT#

 

[riogrande75]

No, you are pretty f*****. The only way to recover is to program the flash ic with a external programmer.
Did this once, but it is hard for unexperienced users.
I suggest to sell the device.

 

[sag]

Hey .. lets not give up .. I think we can still make it .
I am looking into this .. Is there any portanl from where i can get rom dump for VTH5221D ? I think if i can reflash it with the dump it will be good to go again , is it ?

CH341A USB Mini Programmer

https://www.amazon.com/Flash-Programmer-Module-CH341A-Adapter/dp/B07V6PNRY4/ref=sr_1_2?keywords=ch341a+programmer&qid=1648396113&sr=8-2

 

[wittaj]

And learn for next time do not update something that is working!

 

[riogrande75]

Read out the chip, place correct bootloader at the start-address of the current bootloader and flash it.
Then you should be good to start over again.