I know it is not related directly to the HL2 but many people use the Micro PA50 as an amplifier that goes with the HL2.
As the amp had a serious shortcoming, spurious high SWR protection kicking in making the amp almost unuseable, the new firmware changes everything.
I have now made a youtube video on how to update your Micro PA50 amplifier to the latest firmware making this amplifier a good combination with the HL2.
Hope this will help many of you using this amp with the HL2