For Repairing Samsung J700F Dead Phone

I have an SM-J700F dead phone.

At first this phone have FRP, then I try to remove FRP by Octopas, Z3X and Miracle, but not success. After that I flash this phone. After success flash phone not open and also not going download mode.

Now I see Z3X Easy Jtag and Atf Jtag released for samsung J700f dead boot repair.

I want to buy a Jtag for especially repair this phone, but confuse what is better……????:confused: