Phone model and authenticity is unknown - Galaxy S6 Q&A, Help & Troubleshooting

Hello,i have been trying to flash stock firmware on my Galaxy S6 but i haven't been able to do it.While i was digging a solution i noticed that i can't tell which variant of the S6 my phone is.I have been trying to flash SM-G920F firmware until now.I bought the phone 5 days ago at a local mobile shop&service.The real problem now is that i can't tell what has happened to this phone before i bought it.
Back cover of the phone says that my phone is SM-G920F.
It is shown as SM-G920F in phone settings too.
When i enter download mode,it says my phone is SM-G920P.
I have downloaded the "Phone info" app and it says my phone is SM-G920P.
The IMEI is the same everywhere(in the back of the phone,in settings,in "Phone info" app,when i dial *#06# etc.)
I tried looking the IMEI up online and imei.info says my phone is SM-G920F,however the S/N number is not the same as in the back of the phone and in "Phone info" app.The phone settings also show a serial number that differs from the back of the phone and that number is the same as the "Phone info" app number.
Can someone help mee?

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