Did a factory reset. ( settings - privacy - factory reset)
This didnt work either nor did hard reset using the code..
Anyways.. Looked all over the internet and most forums said basically.. Warranty.. Send it back..
As i baught it second hand wasnt sure of wether i could so kept looking....
I then found this.. And my god it was a godsend. I was convinced my phone was dead..
If you have similar issues then follow this..
"Re: Samsung Galaxy S2 ( Baseband Unknown ) help!!!! 1 week, 3 days ago #5921 ABRAHAM
HEY GUYS , i've created an account here just to address this problem :
( only for SAMSUNG GALAXY SII )
Solution 100% solved and WOrking ( BY ME )
1st step , download any compatible android firmware available in your hands. ( if your phone isin't stuck in a boot loop , skip this step, or if u can use everything but GSM cellular network, or any other connection provided by your sim card provider )
2nd : root your mobile using this toolkit here's the link
3rd: step : search in the market for GSII_repair app ( needs root aka superuser access )
4rth step : repair your efs files using this app . ( it's obvious when u look at it )
5th step : search in the market for galaxy s unlock ( follow steps , easy ones )
6th step : ENJOY having your phone back from the dead
PS : this is addressed to all of the guys with the unsolved baseband issues ( unknown baseband)
no imei , imei sv wifi adddress , bluetooth address in a (unavailable) state , will 100 work , hope u enjoy , i blogged for the 1st time in my life to try to help out ppl :_) , try it and reply to me if it did work ( of course it's gonna work"
The 1st 2 steps got my phone working again..
Thanks goes to droid recruit for this!
Sent from my GT-I9100 using xda premium