SOLVED: Blue series (VZM31-SN) zigbee group binding no longer working after upgrade to v2.05

If you are meaning that the switch does not control groups that are binded. then this is a known issue that is fixed in an upcoming firmware release. It has been discussed in this thread.

https://community.inovelli.com/t/blue-series-2-1-firmware-changelog-vzm31-sn/12326