Boot to TWRP. Tried by pressing power + volume UP - just booting into the ROM and pressing power + volume down - keeps rebooting without getting into the ROM. Only successful to get into TWRP straight after flashing with Odin. I think was saying while flashing pressing power + volume down and when screen goes black then move from volume down to volume UP. That's the only way I found how to get into TWRP.
Any advise, please?
Yes, try this:
-power off phone
-plug USB cable connected to your computer
-press and maintain VOL+ and POWER
-wait for TWRP