Request: SPI Flash BIOS Dump (Winbond 25Q128) for Dahua NVR4216-4KS2

[soportemetroil]

Hello,


I am trying to repair a Dahua NVR4216-4KS2 that is not booting.
The main BIOS/firmware is stored in an SPI flash EEPROM (Winbond 25Q128, labeled as U130 on the PCB).


I have a CH341A programmer and I already attempted the following steps:

1. Identified the correct chip (W25Q128, 3.3V SPI flash).
2. Tried to read the contents with CH341A Programmer software. The dump seems corrupted and I often get the error: “Chip with the contents are in disagreement.”
3. Compared several chip type selections (24Cxx and 25Qxx families) to confirm it is indeed a 25 series SPI flash (128Mbit ≈ 16 MB).
4. Verified the programmer works with other chips, so the issue is specifically with this NVR’s corrupted BIOS.

Now, what I need is the correct full dump (.bin file, ~16 MB) of the SPI flash for the Dahua NVR4216-4KS2, so I can reflash it and bring the device back to life.


If anyone has successfully extracted the BIOS/firmware dump from a working NVR4216-4KS2 or has access to Dahua SPI images, I would be very grateful if you could share it.


Thanks in advance for any support or for pointing me in the right direction.

 

[alastairstevenson]

Are you doing an in-situ read with the NVR powered off? Or powered on?

Do repeated reads give the exact same dump file?

 

[soportemetroil]

Yes, I performed multiple reads and the dumps are identical (verified with checksum/hex compare).