Download X-plore the play store.
Set xplore full superuser from the setting. See the picture.
Select the four apk files and overwrite the original (root / system / priv_app) folder.
Then get an error but this is normal.
Restart manually or remove the battery to.
If you want to replace the sim icons you can choose the right one for you. Resize 94x94 (Image Easy Resizer from play store). Then rename the file extension .qmg
Open Xplore, set the apk open zip see the picture. Open systemUi.apk (res/drawable_xhdpi) Select the two .qmg and overwrite the original.
Sorry the bad english.