Recent data from Reticulum II (RetII) require the energy range of the FermiLAT $gamma$-excess to be $sim$ $2-10$ GeV. We adjust our unified nonthermal Dark Matter (DM) model to accommodate this. We have two extra scalars beyond the Standard Model to
also explain 3.55 keV X-ray line. Now the mass of the heavier of them has to be increased to lie around 250 GeV, while that of the lighter one remains at 7.1 keV. This requires a new seed mechanism for the $gamma$-excess and new Boltzmann equations for the generation of the DM relic density. All concerned data for RetII and the X-ray line can now be fitted well and consistency with other indirect limits attained.
A two component model of nonthermal dark matter is formulated to simultaneously explain the Fermi-LAT results indicating a $gamma$-ray excess observed from our Galactic Centre in the 1-3 GeV energy range and the detection of an X-ray line at 3.55 keV
from extragalactic sources. Two additional Standard Model singlet scalar fields $S_2$ and $S_3$ are introduced. These fields couple among themselves and with the Standard Model Higgs doublet $H$. The interaction terms among the scalar fields, namely $H$, $S_2$ and $S_3$, are constrained by the application of a discrete $mathbb{Z}_2times mathbb{Z}^prime_2$ symmetry which breaks softly to a remnant $mathbb{Z}^{prime prime}_2$ symmetry. This residual discrete symmetry is then spontaneously broken through an MeV order vacuum expectation value $u$ of the singlet scalar field $S_3$. The resultant physical scalar spectrum has the Standard Model like Higgs as $chi_{{}_{{}_1}}$ with $M_{chi_{{}_{{}_1}}}sim 125$ GeV, a moderately heavy scalar $chi_{{}_{{}_2}}$ with $50 ,,{rm GeV} leq M_{chi_{{}_{{}_2}}}leq 80,,{rm GeV}$ and a light $chi_{{}_{{}_3}}$ with $M_{chi_{{}_{{}_3}}} sim 7$ keV. There is only tiny mixing between $chi_{{}_{{}_1}}$ and $chi_{{}_{{}_2}}$ as well as between $chi_{{}_{{}_1}}$ and $chi_{{}_{{}_3}}$. The lack of importance of domain wall formation in the present scenario from the spontaneous breaking of the discrete symmetry ${mathbb{Z}_2^{primeprime}}$, provided $uleq 10$ MeV, is pointed out. We find that our proposed two component dark matter model is able to explain successfully both the above mentioned phenomena $-$ the Fermi-LAT observed $gamma$-ray excess (from the $chi_{{}_{{}_2}} rightarrow {rm b} bar{rm b}$ decay mode) and the observation of the X-ray line (from the decay channel $chi_{{}_{{}_3}}rightarrowgamma gamma$) by the XMM-Newton observatory.
