Hikvision NVR (7600 series on 3.4.xxx firmware and below) – Blackwire
Hikvision Dvr Firmware Upgrade - auditgreat
How-to: - How do I update HikVision Firmware in just nine simple steps? - updated 20th February 2019 | IP CCTV Forum for IP Video, network cameras & CCTV software
Solving firmware bugs for Hikvision devices with TFTP Automatic Update Tool | sassec
3 WAYS TO UPGRADE FIRMWARE ON HIKVISION NVR / DVR: WEB, IVMS, BATCH - PIPL.SYSTEMS | Security systems