• Download the firmware from https://samfw.com/
• Download Odin from https://samfw.com/Odin/Samfw.com_Odin3_v3.14.4.zip
• Create a new folder and place the two zip files in it to keep everything organized
• Extract all the files from those two zip files
• Run Odin3_v3.14.4_Samfw.com.exe
• Put your phone in download mode: Turn it OFF, then press Volume UP + down and plug USB cable in.

​You should have a blue screen (see video).

• Drag the files staring with AP (that takes some time), BL, CP and HOME_CSC in the corresponding frame

• Click on the Start button and wait
• The device will restart and you may have to select "Factory reset" in the blue screen
• Don't forget to turn auto update OFF!