Question [Q] Question about f-180 s/l/k ( korean variant )

Hi guys

A friend of mine has the korean varriant of the optimus G ( f 180 s ) and I noticed a problem with the device. It does not connect to the edge service in my country ( Pakistan ). I think its still looking for an LTE connection. when I set the connection to 3g only , it connects but shows G in the status bar. also it does not work at the edge speed. Playstore does not even open.

My question is, If i flash the e975 rom ( following the tutorials to convert an f 180x to e975 ) , will the gprs/edge problem disappear ?. I couldnt find an answer to this specific issue.