Sorry I missed that one. No worries, long as it is up and running
Only just for completeness reason of this thread, I know it’s old:
Her’s a working link to the LATEST 1.7.6.21 ISO for the DX4000.
Because the one listed in THIS thread is broken and you can only download an OLD file.
DX4000 Factory Restore
I think, it can be closed now, there is nothing to write anymore.