Maybe I'm too tired...or too dumb! I can't find a firmware update of the EG4 6500EX-48. I've looked on eg4electronics.com and no luck. the youtube videos from several years ago show a whole different website setup. So, they've upgraded their website and now I can't use it! Typical!! I'd love to find a zip file somewhere, or whatever it takes. I'd even be willing to pay for the dang thing! Any help finding this update would be greatly appreciated. I've been working on my system for several years now and finally just a couple steps from being off grid...YAY! Need to get the 4 inverters up and running together and talking to the batts, then I call my electrician back one more time to do the final AC disconnect/reconnect. Everything's in place and I got one inverter up and running and charging batts so that's encouraging. When I tried to get the second inverter running I got error 61 and everything I've read says the firmware update will fix that. I'm going to dig into the inverter programming a little more and maybe that'll fix it, but still sounds like a good idea to do the update on all 4 units. Thanks.