I have tested some firmware with pit also on z3x pro but failed. you can see flashing logs under this post.
i have cleared this problem by flashing this phone with odin. 4 file firmware and pit file.
first download this firmware S5570IJPLC1_S5570IOJPLC1
all files and name screenshot
Now download Odin3 V1.84 and select files as shown in picture.
Reset phone to factory defaults.
by pressing Volume up+ Home+ Power key release power key when you see Samsung logo on screen. then you will be in recovery screen just select restore factory setting. then reboot phone you have done.
Note: this is tested by me me and this website not responsible for any damage by your own mistake or problem in phones hardware.