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Unlike standard firmware updates (which use .dav files via USB or Web GUI), a is a complete copy of the EEPROM/Flash IC's memory. It is necessary if:

) from several specialized firmware repositories. These files are typically used with a hardware programmer (like an RT809F or CH341A) to repair "bricked" DVRs or reset forgotten passwords.

: Lists this specific model under entry #32 in their free DVR firmware collection. Irantk : Offers a direct download for the DS-80237-P REV5.2 Bios DUMP.rar .

Are you planning to use a (like a CH341A) to flash this file onto the chip? DVR Firmware Bios DUMP Free Download - AliSaler.com

The following sites host the specific .rar archive for board revision 5.2: : Provides the DS-80237-P REV5.2 Bios DUMP.rar (approx. 13.6 MB).