: Typically a Winbond 25Q128 series chip (128 Mbit / 16 MB capacity).
> info Device: DS-80249-P Revision: 1.2 Firmware: v2.0.1 (2025-02-10) Uptime: 14d 8h 23m Temp: 42°C Vcore: 1.21V Reset cause: Power-on Watchdog: enabled, 2.0s
In late 2024, a vulnerability (CVE-2024-8923) was disclosed affecting all DS-80249 firmware prior to Rev 1.2. The flaw, dubbed “KeyConv Drain,” allowed a physically proximate attacker with USB access to extract cryptographic keys via a timing side-channel in the random number generator. Rev 1.2 replaces the affected RNG with a NIST SP 800-90A compliant CTR_DRBG.
To fix this, force the microcontroller into its system bootloader mode using physical hardware straps (such as pulling a BOOT0 pin HIGH or holding down a hardware reset button while powering on) and re-flash your saved backup file. ds-80249 -p rev 1.2 firmware
Verify the revision number printed directly on the silk screen of the PCB.
Indicates the specific factory layout of the board components. Revision 1.2:
Download the formal firmware .dav file from the official Hikvision Download Portal. Format a USB flash drive to layout. : Typically a Winbond 25Q128 series chip (128
A subtle bug in the SPI driver of earlier firmware caused bit banging errors when communicating with high-speed MFRC522 RFID readers. The Rev 1.2 release recalibrates the clock divider registers, eliminating CRC mismatches during card reads.
Compare the output string against the official release documentation provided by the manufacturer. If any character differs, destroy the file and download a clean copy. Step 2: Hardware Interface Mapping
Double-check that you didn't accidentally download the Rev 1.1 file. Verify file extension (.bin, .hex, or .img). Corrupted flash or interrupted power. Indicates the specific factory layout of the board
A bad sector in the onboard Flash memory, often due to previous interrupted writes. Fix: This sometimes requires a low-level format. In the flashing tool, enable “Force Full Chip Erase” (not just sector erase). If that fails, the Flash chip may be physically failing—contact support for RMA.
[CH341A Programmer] ---> [SOIC8 Clip] ---> [DS-80249_P SPI Flash Chip]
Users can expect a smoother, more responsive experience with their device, thanks to performance optimizations.
