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– those are for completely different hardware. ds-2cd1021-i firmware download

There are three main ways to install the downloaded firmware: 1. Web Browser (Easiest Manual Method) V5.4.5_Build170123(Released) - DOWNLOAD EU PORTAL – those are for completely different hardware

is straightforward but requires precision to avoid "bricking" the device. DS-2CD1021-I - Network Cameras - Hikvision Europe ds-2cd1021-i firmware download

HIKTOOL is a dedicated upgrade tool from Hikvision that supports batch upgrades across multiple devices. Place the firmware file in the tool’s working folder and follow the on-screen instructions.