[Q] WiFi works on secured network, but not on open

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Hello!

The flash on the phone is the one before 8107, i cant remember it anymore, i sold it to someone. But now he contacted me and told me it does works on a secured WiFi network, but not on any open network. It still connects, but there is no actual data flow. Is it even possible?

What happened to the phone is i have downgraded it to 7004, used Chevron and updated till 7392 and then installed Hungarian language via root explorer, then kept updating till the one its on at this moment. I must had screw up something, but i have lost unlock, even tho i paid caution to prevent it. So i used windowbreak to re-unlock it. And that's it. What could be the reason? I'm really confused.

P.S: I also used some Samsung Tool or whatever i cant remember anymore to enable Internet Sharing option.

Hello please could someone help me?

Sent from my Galaxy S2 using Tapatalk

BUMP! Pls make some input. No one met this problem?

Im really wondering if none have encountered such problem. Any ideas?