Hello friend, yes the NVR has the latest firmware, please don't worry. You could find the firmware of the cameras connected to the NVR here: https://support.reolink.com/hc/en-us/articles/360005175034-How-to-Find-out-Camera-Firmware-Version-on-IP-Channel-page-via-Reolink-PoE-NVR
Hi, you can upgrade the single-camera or the nvr's firmware via the Mac client. It's not supported to upgrade the firmware for the cameras added or linked to the nvr system. If you want to upgrade the firmware for the cameras linked to the nvr, please do it on the NVR.
I just purchase a wireless Logitech mouse off of amazon refurbished for $10. It works right out of the box. I didn't have to download any software. I just plugged in the receiver in the usb port on the front of my Reolink NVR and turned on the switch on the mouse and it worked!
Appreciate it if you can provide some pictures on how the camera was mounted and what it looked like from the camera angle. The communities are able to share thoughts with more information provided here.