As far as I understand, you can not use original xyz software (xyzware) after flashing repetier-firmware.
One of the major benefit of flashing repetier-firmware is that you don't have to use xyzware. XYZware is buggy slow and generate low quality prints. Allow use of 3rd party filament is just a bonus.
(Da Vinci 1.0, Jr. 1.0 RAMPS, miniMaker) X4, (Creality CR-10S, CR-10 mini, Ender-3) X4, Anycubic MEGA X4, Anycubic Chrion X1, ADMILAB Gantry X2 (MonoPrice Maker Select V2, Plus, Ultimate)X4--Select mini X1, Anycubic photon X4, Wanhao duplicate D7 X1.
iNSTONE Inventor Pro X2, CTC Dual X2, ANET-A8, Hictop 3DP-11, Solidoodle Press, FLSUN I3 2017X1