If your DVR is connected to a network, you can often update it remotely:
Older firmware often contains known vulnerabilities. Hackers actively scan for outdated DVRs to join botnets (e.g., Mirai) or to gain access to your live feeds. A new firmware update closes these backdoors. dvr5608ln firmware update
If you can confirm if your device is a (often found on the front panel or the bottom sticker), I can help find the specific firmware link. If your DVR is connected to a network,