[Q] 4zroot not working on samsung galaxy 5 gt 15500

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http://forum.xda-developers.com – Hi all bit of a noob, Could not find section for my phone! Samsung Galaxy 5 gt 15500 Froyo 2.2 Anyway downloaded z4root using QR from this site V1.3.0, thread closed so could not post there. Tried to root but it did not root. Tried z4root again and just got a white screen , waited for a while nothing happened, just a white screen, pressed home and returned to home page OK. I tried to reboot and everything came back, still not rooted but z4root now worked. Tried this 3 times again with blue screen but did not work. Re-installed app a couple of times. Any suggestions on any similar app t (HowTos)