Sometimes we need to check the firmware version that is flashed on your GROM kit. It is easy to do!
For GROM-USB3, MST4/MST3P, AND2, IPD4, USB2P units:
To check firmware version switch to USB mode of the GROM. While playing music from USB connected device i.e. USB flash drive, Android or Ipod/iphone (USB3/MST4/IPD4 only).
Unplug from USB port. The track number will change and show current version number of Firmware.
There is no way to check the firmware on GROM-BT3 units unfortunately.
Let us know if there are any questions!