Right click on Firefight Reloaded

Click "Browse Local Files" and then go to the firefightreloaded folder.
Then. the CFG folder

Copy any CFG and paste it on your Desktop.
Rename it autoexec
Open it using notepad, then delete everything in it,
Now copy and paste all of this into it.

mat_dxlevel 60
cl_ragdoll_collide 0
mat_picmip 4
r_WaterDrawReflection 0
r_WaterDrawRefraction 0
mat_wateroverlaysize 8
r_lod 5
mat_fullbright 1
mat_diffuse 5
mat_bumpmap 0
r_shadows 0 [remove if you want the flashlight]
mat_fullbright 1
mat_forceaniso 0
mat_forcehardwaresync 0
mat_reducefillrate 0
mat_mipmaptextures 0
mat_filtertextures 0
mat_bloom 0
mat_envmapsize 32
mat_envmapgasize 8
mat_antialiasing 0
cl_phys_props_enable 0
mat_filterlightmaps 0
mat_showlowresimage 1

Now that you copy and pasted all that into it. save the file
Now move it to the CFG folder
And when you load up the game, press ` on your keyboard and type in:
exec autoexec keep in mind you'll have to do this each time.

And now you can run the game