I connected the first speaker and ran identify and it identified the speakers: 3.16, BIOS 03, HWv9, Z8 2.053

But when I tried to update it started and then said "power off/on" and then started "loading" however it then failed with "timeout reading from COM3".

I started the update again and the second time it worked fine.

For the second speaker I had no issues.

Main: Marantz Cinema 50, Meridian 271, DSP7200.2, DSP5200HC, DSP5000 rears, Meridian 210.
PC/Headphones: Mytek Liberty II, Sansui CA-F1, Sansui B-2301, Sennheiser HD800, Kef R3