Use Evolution-X dashboard, evoxdash (aka Remotex) don't use a hexen disc simply run it from the hard drive.
EvolutionX dashboard +3935 download link: https://downloads.diodematrix.com/homebrew/xbins/Console Based Applications/apps/dashboards/evolution-x/_official/EvolutionX Build 3935.rar
Upload the extracted content to e:\apps\evoxdash\ or f:\apps\evoxdash\. Rename the file evoxdash.xbe to default.xbe.
If not already present, create a bios subfolder and upload your custom bios's dot bin file into it. Power cycle the console to rebuild the applications menu of the default replacement dashboard.
Run RemoteX from the Applications menu. (RemoteX is the XBE Title in evolutionx's default.xbe file header).
Use the D-pad to highlight the menu options below then press A to select / enter each submenu function:
System Utils
Flash BIOS
Select the BIOS file you wish to flash from the list of available files
Finally, press Y to verify that you are ready to flash this BIOS file to the modchip.
Press B to go back a level in the menu.