Samsung Galaxy S9 "only official released binaries are allowed to be flashed(RECOVERY)"

/e/OS Devices Samsung
23

Thanks @SuzieQ.

1.I received the new phone on Wednesday March 24, 2021.

2.I am unsure how long the “RMM STATE : Prenormal” has been showing. I only began trying to figure out the problem after I couldn’t get TWRP to flash.

2a. Is “RMM STATE : Prenormal” the reason why "Only official released binaries are allowed to be flashed (recovery)” is showing on the phone after flashing via Heimdall?

  1. I can access the OEM Unlocking option in developer options and it is on when I flash with Heimdall. From what I can tell the bootloader is unlocked but Knox is blocking the flash.

  2. My first attempt to flash this S9+ was via Odin 14.4. Here is what it does👇

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  1. My 3rd attempt was the Easy Installer.