| friend the sn is not so important so do not pay much attention to that but if you want to recover you had to save the efs when I had the original imei what you can do is load an efs of any team but you will be another sn I leave working like that and they do not fail me friend but if you want a sn look for ub efs that serves you but if it does not work for you it will put the imei null |