New here to XDA after trying to find solution/answers to a problem that popped up suddenly. Sorry for the short story below but I figured all info was pertinent. I also realize this phone is outdated and the thread is old but its my only phone other than my company phone and I don't see the need to buy another if this can be fixed. Thanks in advance for any help.
My ATT note 3 battery died one day so I plugged it up to charge. After awhile I came back to turn on the phone. During initial boot I immediately noticed a strange icon(custom padlock) that I hadn't noticed before. When my phone loaded I was met with sim card not installed(switched to straight talk from att a few months prior). OK? Tried the typical powering down/rebooting but nothing worked. Tested my sim in my girls phone and it worked so I put back in mine again...nothing. Since then, I've spent hours looking for solutions. I read the only way the custom padlock would even be present was if my phone was rooted. Not sure what happened, but I had and have no desire to root my phones. Last time I did anything similar was back in the iphone 3 days when jailbreaking was big. Phones can do anything I need now, so I just haven't seen the need--except for instances like this apparently. Anyway, I started researching more about whats going on. Google seems to only show up older posts with solutions so the first thing I found out about was ODIN and flashing new firmware. Initial flash was back to jelly bean(I had no idea what I was doing(and still don't!)) but didn't succeed so I gave up for a couple months. Started researching again and found out why I cant downgrade, so I tried another fw, this time NL1 I think. Successful flash, but nothing changed except the phone stopped recognizing that a sim wasn't inserted. At that point I think I went flash crazy not knowing what fw was what so I may have flashed fw for different note 3 variants(not sure though). Eventually I pieced everything together. Upon more research came to the conclusion my EFS is most likely corrupted(no I didn't back it up, as I later found I should have!). I found the lowest fw I could down grade to(NC2) and did another fresh install with the BL,AP,CP,CSC and PIT files. Still no luck. I now know the problem is "unknown" baseband, and "unknown" imei. Network, mobile network type, imeisv also show unknown. Mobile network state- disconnected. I searched for solutions related to unknown baseband/imei and tried fixes related to such- flashing different modems, flashing different fw with corresponding modems and nothing has helped. I have verified that nothing is showing up in the EFS folder. I tried someones solution and was able to flash an efs image using safestrap and that shows all the folders/files in the EFS folder but still no luck. I'm at a loss now. My original firmware when the problem started was lollipop OTA(not sure which version). Any suggestions would be helpful. Don't really have the funds to get another phone at the moment. WI-FI works by the way.
---------- Post added at 10:09 PM ---------- Previous post was at 09:57 PM ----------
I also know what my IMEI is supposed to be if that helps at all