Ensure the USB drive is formatted to FAT32 , not NTFS or exFAT.
Search the Sannce Support Portal for tools like "Device Manager" that can auto-detect and update firmware. h264 dvr firmware v262r07 download upd free
What is the listed in your system information menu? Ensure the USB drive is formatted to FAT32
The number one rule of any firmware update, regardless of device, is to Using a file from a third-party website is extremely risky and could damage your DVR. The number one rule of any firmware update,
It can automatically alert you to critical security updates that fix common H.264 issues like screen freezing or NAT/DNS vulnerabilities. How to Use the Current Update Feature
Security DVRs run on specialized internal software called firmware. This software controls camera recording, network connections, and remote viewing apps. Over time, manufacturers issue updates to fix system bugs and patch dangerous security holes.
Provide instructions on how to after an update Show you how to set up remote viewing on your phone