Hello, first you need to know what firmware version your phone is. Then you can use a search for the required version of the combination file.
I'll write you some details, about combination files, how to check version, date, android version.
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Sample:
COMBINATION_OXM_FA80_G960FXXU2ARG2
OXM=CSC build = [OXM]
FA80=Android version = [Android 8]
G960F=Phone model = [G960F]
XXU2= Version and security BIT = [XXU,BIT2] (that you should never try to downgrade)
ARG2= Date of release and revision = [July 2018, revision 2]
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FA81=Android 8.1
FA80=Android 8
FA70=Android 7
FA60=Android 6
FA51=Android 5.1
FA50=Android 5.0
FA44=Android 4.4
FA43=Android 4.3
FAJP=Android JB
FTMA=Tizen
=======
O=2015
P=2016
Q=2017
R=2018
S=2019
=======
A=January
B=February
C=March
D=April
E=May
F=June
G=July
H=August
I=September
J=October
K=November
L=December
=======
1=Revision 1
2=Revision 2
3=Revision 3
4=Revision 4
5=Revision 5
6=Revision 6
7=Revision 7
8=Revision 8
9=Revision 9
A=Revision 10
B=Revision 11
C=Revision 12
D=Revision 13
E=Revision 14
F=Revision 15
