Model II Firmware Without a T1 ToneMatch® Audio Engine
You need a computer and a T1 ToneMatch Audio Engine or T4S or T8S ToneMatch Mixer[1] to do firmware updates to your L1® Model II or Model 1S.
If you have a B2 Bass Module and L1 Model II and a T1 ToneMatch Audio Engine then you will need the L1® Model II Power Stand Firmware Updates.