Samsung rmm unlock

Hallo Support, I have been reading some successful done jobs by UAT, I want to buy this tool, I want to know if it supports RMM unlock in download mode, I have a J720F, U3, this phone needs fix DRK but unfortunately have RMM LOCK, and phone is stuck on SAMSUNG logo, I have tried many tools on the market, but none can solve, when I try to flash TWRP, it gives error that ONLY OFFICIAL FIRMWARE can be flashed, If I try write EFS file, it gives same error, the phone is stuck on SAMSUNG Logo since January 2019

I want to know if you have solution for this phone, then I can buy your product
Thanks in Advance

KIND REGARDS
fragga

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