Found this firmware (remake) on github
Downloaded and the only thing I tweaked on it was turning down the #define MAX_JERK 20 settings from 20 to 5, and made the initial name screen say X1 instead of X1 TRMN #define UI_PRINTER_NAME "X1 TMRMN"
Installed the Sanguino board from the link in his how to install
Compiled in Arduino IDE but told it to Export compiled Binary...it generated the .hex files
Used Octoprints firmware upload plugin to flash it to the board
Low and behold it updated...rebooted and came up without issue
Did a test print and it definitely changed how it sounds, but it printed a calimouse absolutely fine
I will include the .hex file here (In fact..I will zip up the repetier directory and include here as well)
New April 2019 x5st-400 and the power supplied failed. I like the machine. Its all dialed in. Was making good stuff. And when I went to check on a 10 hour job, 1 hour in, it was just dead and powerless. No telling what happened. No burning smell or fried wiring. Hopefully the main board is good. I'm hoping it just turned off without any surges.
Anyway... I've written Banggood about getting a replacement powersupply or even full printer. Awaiting reply. In the mean time... Can anyone recommend a good, reliable, robust, replacement power supply I should try to insist on - or if they tell me to 'piss off', one I should buy out of pocket?