What specific (bootloop, carrier unlock, system lag) are you trying to fix? Which Android OS version are you currently running? Share public link
Follow these instructions carefully to flash your Samsung device: Step 1: Boot Your Phone into Download Mode Power off your Samsung device completely. Press and hold the required key combination. Devices with Bixby/Home button : . ultimate samsung flasher v1.5
Automatically detects connected Samsung hardware interfaces. Core Technical Requirements What specific (bootloop, carrier unlock, system lag) are