Applies to: DT41Y/DT61Y/DT81Y/DN41R/DN61R/DN81R/DT41GB/DT81GB/DT61GB/DW41JD/DW81KD/DW61LD/DT81DP/N48PI/N44PI/N46PI/N44PAM/N48PAW/N46PCK/N88PCH
1. Please use a computer to download the firmware file. You can send email to firstname.lastname@example.org to get the download link of the new firmware file. But please tell us your system‘s model number. It is made up of numbers and letter such as N44PI. You can find it at the bottom of the recorder. It is not SN like SZ20150427.
ATTENTION: THE FILE CAN NOT BE OPENED BY ANY SOFTWARE ON COMPUTER. DON‘T TRY TO OPEN IT.
2. Copy the file to a memory stick.
3. Connect memory stick to the USB port of NVR or DVR.
4. Go to menu---maintenance---system---upgrade. Check if it can find the firmware file in a memory stick.
select the file and click upgrade.