Firmware update failiure

[imran_is]

Hi

Have tried updating the firmware on my NVR [DS-7604NI-E1 / 4P] which is currently running [V3.2.1, build 150304]
downloaded the latest firmware off the Hikvision Eu portal [V3.4.91build161220] and tried updating using a usb.
I keep getting the error 'upgrading failed, firmware mismatches'
Also tried using an older firmware which gives me the same error, the NVR was purchased as a UK spec

Any help would be appreciated
Thanks

 

[Kieran]

You'll want to first update from v3.2.1 to v3.3.xx before then updating to v3.4.xx.

The right section for your NVR is at the below link.
DOWNLOAD PORTAL

Make sure that you downloaded the correct firmware for your -E series NVR and not the firmware with the same version number and build for the -I series NVRs.

The right firmware file for the E series has K41 in the filename, not K51.