Which is Best JTag or Dead Boot repair for samsung and china phone


Hi all

I want to purchase dead boot repair or JTag box for New Samaung mobile and china mobile

I want to know which box is good for me and which is most updated and success in dead boot repair

EASY JTAG Z3X
GPG EMMC JTAG
OCTOPLUS JTAG
MEDUSA PRO OR MEDUSA JTAG
RIFF JTAG OR RIFF JTAG 2
or other one you know

Pls help