I'm unable to extend the signal of a zong 4g device using a TP-Link TL-MR3420 router. It's asking for APN, Dial number, username and password in setup. Also, in setup whn i select country Pakistan it only displays ptcl and Worldcall as ISPs. I've tried entering APN: zonginternet, dial number: *99# and leaving username and password blank. Also tried user/password as admin.
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