Dahua model
VTO6521H-D-S2
Dahua lists 2 firmware files for the VTO6521H-D-S2. This is the retail model name. Inside the firmware, Dahua uses its own device IDs, listed below, which can lead you to more compatible firmware.
- Firmware files
- 2
- Newest
- Oct 5, 2026
- Listed by
- Dahua
- Dahua device IDs
- 9
Firmware
- DH_VTO65XXX-C-H-Freyja-A3_MultiLang_PN_V4.810.0000000.2.R.260612.zipDownload
Released Oct 5, 2026 · V4.810.0000000.2.R · 9 devices · Dahua
- DH_VTO65XXX-C-H-Freyja-A3_MultiLang_PN_V4.810.0000000.1.R.250919.zipDownload
Released Oct 27, 2025 · V4.810.0000000.1.R · 9 devices · Dahua
Dahua device IDs in this firmware
Compare these with the updateSerial your device reports. Each one links to every firmware found for that ID.