Are you referring to an XLX reflector in C4FM mode?
XLX in C4FM mode is not a real YSF reflector. It is internally a DMR engine performing an automatic TLV conversion to C4FM within the same module.
Thus, to bridge this you can use MMDVM Bridge: YSF reflector on one end while bridge to an XLX DMR on the other end. There are two options to set up DMR XLX:
1) DMR Gateway (simplest)
2) HBlink3 (may need some understanding of Python to troubleshoot during installation)
After that, bridge the existing YSF reflector to the XLX DMR using MMDVM_Bridge. URL information of the instructions already provided previously on this thread. Diagrams on how to set this up as shown below.
YSF Reflector to XLX DMR only:
YSF Refector <-> YSFGateway <-> MMDVM Bridge <-> DMR Gateway (or HBlink3) <-> XLX DMR
YSF Reflector to XLX C4FM:
YSF Refector <-> YSFGateway <-> MMDVM Bridge <-> DMR Gateway (or HBlink3) <-> XLX DMR + YSFGateway to port 42000 of XLX reflector of the same module