fvanz

Hey guys
 
Thanks a million! I had the same experience with my 48V VMIII tonight. Updated main FW to 41.17 as per link in another thread on this forum, but display was not working after the update. Tried what jarjarbeens  said  with no success initially. I Just kept trying and trying and FINALLY got communication between the flashing tool and the inverter after about 20 attempts, trying different sequences.  When I powered the inverter on after the Main FW update, you could hear relays clicking with the fans on. The fans would go off after a few seconds, with some relay clicking that followed.
I followed what Jajarbeens posted above. The only thing I can add is that the power button needs to be IN (on) on the removable display. I got success when I pressed "Update MCU" on the flash tool about 3-4 seconds after I switched the AC power to the inverter on, just before the fans stopped. I figure that would before the normal starting 6 second countdown elapsed. Took about 20 seconds and then the flash started. Whole flash took 9 minutes and the display came on immediately after the flash completed. Restarted the inverter and confirmed that the Main FW was indeed 41.17, and the MCU version is 02.66 (that coulomb provided).
Once again thank you for all the generous information on this forum.

Hey guys
 
Thanks a million! I had the same experience with my 48V VMIII tonight. Updated main FW to 41.17 as per link in another thread on this forum, but display was not working after the update. Tried what jarjarbeens  said  with no success initially. I Just kept trying and trying and FINALLY got communication between the flashing tool and the inverter after about 20 attempts, trying different sequences.  When I powered the inverter on after the Main FW update, you could hear relays clicking with the fans on. The fans would go off after a few seconds, with some relay clicking that followed.
I followed what Jajarbeens posted above. The only thing I can add is that the power button needs to be IN (on) on the removable display. I got success when I pressed "Update MCU" on the flash tool about 3-4 seconds after I switched the AC power to the inverter on, just before the fans stopped. I figure that would before the normal starting 6 second countdown elapsed. Took about 20 seconds and then the flash started. Whole flash took 9 minutes and the display came on immediately after the flash completed. Restarted the inverter and confirmed that the Main FW was indeed 41.17, and the MCU version is 02.66 (that coulomb provided).
Once again thank you for all the generous information on this forum.