Versions of M2
Determine if your M2 processor board is V4 or V3.
Image showing differences between M2 versions 3 and earlier and version 4
There exist multiple versions of M2, the picture above shows several easy to spot differences between V3 and earlier and V4. Most notably are the white buttons and larger arrow indicator on the V4.
For the majority of use cases, the version of the M2 will have little effect.