I was also not able to get UACC-CM-RJ45-MG to work in a CRS309. The module is recognised in the CRS309 but I can't get it to link with an identical module in a Unifi switch on the other end. I also wanted to find a BCM84891-based SFP+ module as the S+RJ10 runs at 95C+ at 10G and hits thermal cutoff....