UNI-T UPO 2000CS series, UPO 2074 CS - need firmware

[avrusb]

Hi there

I recently got a UNI-TREND oszilloscope UPO2074CS with an interrupted firmware update. It starts up with message in picture 1. When I put in a blank USB stick in, it searches for Firmware (USB stick blinks) and then gives up. (picture 2)
I can't ask the former owner, he is deceased.

I already looked on UNI-T website, could not find anything related to the UPO2000CS series. And I already emailed to tech support, no answer.

If anyone has the firmware for UPO2074CS and perhaps the software for PC, would be appreciated!