I found an old thread from here for a custom firmware, but the google link for the binary was dead. I also found the bitmain https://shop.bitmain.com/support/download firmware page, but chrome says "virus detected" so not sure wth...
also, there were a ton of options, so wasn't sure which one to download.
My idea is to lower the freq to run it at around 1000W with 120v.
thanks in advance