You cannot cross-flash between V5.4.0 and V5.5.0 major versions without a special intermediate bootloader update.
: Most firmware downloads come as a .zip archive. Extract it to find the digicap.dav file, which is the actual update file. 3. Installation Methods Method A: Web Browser (Recommended) Firmware - Download - Hikvision Global
As the DS-2CD1021-I is an older generation model, it may no longer receive active security patches (End of Support). Organizations must apply compensating controls:
Use the Hikvision Search Portal by typing your model number to find the latest "digicap.dav" file.
The Hikvision DS-2CD1021-I is an older 2MP (1080p) bullet camera . Hikvision has significantly changed its firmware structure over the years.
Hikvision removed many legacy firmwares from their main global portal. Try these official channels: