I've bought an S5. The firmware was SM-G900H (G900HXXU1ANCG) and working and IMEI was correct, but it says G900F in battery bay (with SSN: G900FGSMH). Since it says "No Service" when I turned it on, I decided to update firmware (tried G900HXXU1ANE2) but my IMEI changed to 0049.

Thus I need to turn back original firmware G900HXXU1ANCG. But I also have suspect that it might be indeed G900F. Is it possible that reseller flashed wrong firmware (G900H firmware to G900F hardware) If not, I need to return back the original firmware, but I can not find this firmware version (ANCG)