"en" typically signifies an English-language or international version. Status: This is a legacy or specific regional build. Secure Download & Installation Steps
: If the camera is a Hikvision OEM, use the SADP (Search Active Device Protocol) tool to identify the current software version and hardware serial number. v5.2.1.37-en-ptc01 firmware download
V5.2.1.37-en-ptc01 Firmware Download - Google Drive - Google Docs Loading… Sign in. docs.google.com V5.2.1.37-en-ptc01 Firmware Download - [hot] v5.2.1.37-en-ptc01 firmware download
No new recurring errors after the update is a green light. v5.2.1.37-en-ptc01 firmware download