hello guys i have imei issue. when i got the phone i backuped all stock data (include EFS), i tried to make some fun so my phone got bricked, i flashed rom with odin and i restored all my data with twrp. everything is fine but it shows EMERGENCY CALL ONLY no network.. i'm gonna go a gsm service for patch certificate but for future how i'm gonna backup cert for possible bricks that may happen if it can't backup can you explain why, what is and where it stored?
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