Hello everyone. I'm a new member here so if I forget to mention crucial information needed to get technical support, please let me know.
Surprisingly it all started when my Galaxy Note Pro 12.2 (SM-P900) was low on battery yesterday. I had to go to college so I took my external battery with me and charged it in my backpack. I didn't need my tablet so I left it in there (was working fine before) and I came back to it this morning to find that it had restarted. It was on the glowing blue Samsung logo, but it wouldn't load past that. I tried restarting it and it wouldn't boot past the logo no matter what. So I tried booting into Android System Recovery (Power + Volume UP) to wipe the cache and still, same results. This is where I can see the error "E: failed to mount /efs (Invalid argument)".
I also did the following:
*Download Samsung Kies (both version 3 and the other since each one says it's not supported and to download the other) and try to resolve the issue. Tablet could not be recognized by either version. No fix.
*Download ADB and the official firmware and flash it (adb gives various errors, ex: can't connect. I may be doing the commands wrong as I'm no expert at this). No fix.
*Download Odin in an attempt to flash it, but the first search result in google was a professional-looking website that actually had a trojan-horse for download; had to shut down my PC and run MalwareBytes, Avast! and McAffee to ensure that nothing remained.
I've been at this since morning. I've also looked at other topics and websites about this problem but I can't seem to find a straight-forward solution. Can anyone please help? I desperately need my tablet for work as soon as possible.
Thanks in advance, and please be precise and clear with your answers (because I'm not so good at Android/Linux commands, or rooting or anything that isn't spoon-fed).
Update: Still not working after I tried to apply TWRP 2.8.6.0 (zip) through System Recovery. After finding, opening and verifying the package it gives the following error message:
E: failed to seek in /tmp/sideload/package.zip (Value too large for defined data type), E: signature verification failed, E: failed to mount /efs (Invalid argument).
I should also note that throughout the entire time I used the official firmware, I haven't used any custom ROMs but I'm now open to it since I have to do all this.
Update 2: Downloaded Cyanogenmod Installer and while it was about to install, it detected the device needed to be repaired. My device was in Android System Recovery under the "apply update from ADB" selection, and these errors came up when Cyanogenmod tried to fix it: "E: footer is wrong, E: signature verification failed".
BIG Update (3): I managed to find the legit Odin application and flashed TWRP v2.8.6.0. However, I'm not sure what to do from this point on out. Help?
Surprisingly it all started when my Galaxy Note Pro 12.2 (SM-P900) was low on battery yesterday. I had to go to college so I took my external battery with me and charged it in my backpack. I didn't need my tablet so I left it in there (was working fine before) and I came back to it this morning to find that it had restarted. It was on the glowing blue Samsung logo, but it wouldn't load past that. I tried restarting it and it wouldn't boot past the logo no matter what. So I tried booting into Android System Recovery (Power + Volume UP) to wipe the cache and still, same results. This is where I can see the error "E: failed to mount /efs (Invalid argument)".
I also did the following:
*Download Samsung Kies (both version 3 and the other since each one says it's not supported and to download the other) and try to resolve the issue. Tablet could not be recognized by either version. No fix.
*Download ADB and the official firmware and flash it (adb gives various errors, ex: can't connect. I may be doing the commands wrong as I'm no expert at this). No fix.
*Download Odin in an attempt to flash it, but the first search result in google was a professional-looking website that actually had a trojan-horse for download; had to shut down my PC and run MalwareBytes, Avast! and McAffee to ensure that nothing remained.
I've been at this since morning. I've also looked at other topics and websites about this problem but I can't seem to find a straight-forward solution. Can anyone please help? I desperately need my tablet for work as soon as possible.
Thanks in advance, and please be precise and clear with your answers (because I'm not so good at Android/Linux commands, or rooting or anything that isn't spoon-fed).
Update: Still not working after I tried to apply TWRP 2.8.6.0 (zip) through System Recovery. After finding, opening and verifying the package it gives the following error message:
E: failed to seek in /tmp/sideload/package.zip (Value too large for defined data type), E: signature verification failed, E: failed to mount /efs (Invalid argument).
I should also note that throughout the entire time I used the official firmware, I haven't used any custom ROMs but I'm now open to it since I have to do all this.
Update 2: Downloaded Cyanogenmod Installer and while it was about to install, it detected the device needed to be repaired. My device was in Android System Recovery under the "apply update from ADB" selection, and these errors came up when Cyanogenmod tried to fix it: "E: footer is wrong, E: signature verification failed".
BIG Update (3): I managed to find the legit Odin application and flashed TWRP v2.8.6.0. However, I'm not sure what to do from this point on out. Help?
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