I'm not really sure yet. I would imagine it's just Odin. Though a flashable bootloader zip for twrp is not floating around yet. I used to make them for other devices but not sure if it's possible for samsung
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I thought it would just be for odin but I have been afraid to try. Maybe I'll try to see if I'm able to revert back to 1AQI1 backups.
yash92duster for LightROM does have a flashable zip for TWRP for updating bootloader & modem (his also includes TWRP in). I used his zip to update to BQKG before trying LightROM. Nice cause it's much easier flashing with TWRP than odin. I try to avoid odin whenever possible.