On android 6.0.1

1- Be completely in the complication AQG1 . APJ2

2-Install superuser

3-Yhen download and install flashfire

4-Download the Custom ROM and pass it to the micro sd or internal memory

5-To use flashfire go settings change the date to year 2013

6-Open flashfire give permissions, then select flash zip or OTA, they look for the downloaded file they select it, select Mount/system read/ write

7-select wipe , they select the first 3, they select internal storage and select the pigeon

8=Selec FLAHS and OK

9=Wait 10 to 20 minutes and enjoy

10=Well, if you install the rom, the files of the internal memory will not be deleted. Reset the factory cell phone from settings

On android 7.1.1

1-Use odin to downgrade to android 6.0.1 after unzipping the folder come 4 files select in the corresponding places, same as in the csc file you will have to decompress it with 7-zip and odin select PIT and look for the PIT in the csc folder as you select it when you return to 6.0.1

do not download more of that compilation if it's not going to leave error

2- Then remove the battery from your cell phone, put it back again press home key plus volume up button more power button select restart factory and restart

3-Follow the steps of android 6.0.1