[Q] Blank IMEI and No signal problem - Galaxy Note GT-N7000 Q&A, Help & Troubleshooting

My phone first was stuck on boot-loop and in recovery mode it was giving error "failed to mount /efs"
I tried flashing different roms but none seemed to work until I found N7000ZSLPF_N7000OZSLPF_OZS, it did install but now my phone doesn't detect sim card and its IMEI is also blank\undefined. My phone is an unlocked\international version so there is no question of any country\carrier lock.
I switched to recovery mode and it still gives that efs error.
Any help will be highly appreciated to solve this problem.

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[Q] i9000 - Can't boot or write to SD

Hello,
I am(was) running MIUI version 2.1.13.
Recently my phone kept freezing, leaving a black screen with nothing but the backlight on.
I tried re-flashing the phone to a previous version of MIUI and after that all of my problems really began...
first of all after reflashing I can't write anything to the SD card... I mean I can but after I reboot the phone the file is gone(and if I format the card or erase a file they are back after the reboot)...
even if I manage to get MIUI or CM7 running after each reboot of the phone my login to my google account & market are lost... so basically every time I load up the phone it is as if I just flashed it. also I keep getting all sorts of services crashing notices.
when I try reflashing any other ROM I get the following error:
Can't access to '/system/csc/xee/system/'.
and the phone stays stuck on the Samsung LOGO or enters a boot loop.
I tried STOCK, Darky, Operators rom & PilotX...
Can some one please help me?
Reflashing a stock rom with odin or heimdall should always work...if not, maybe your sdcard is broken?

[Q] Odin3 stuck at "setup Connection"

I really messed my phone up and now I can't get any roms to install. I tried to go back to ATT stock rom and now I get ATT World Phone but stuck in the Samsung Recovery Utility and get E:failed to mount /dbdata. The only choices are "reboot", a couple of "wipes", and apply Update from SD card. When I try "update" I get a signature verifcation error. ATT was able to show me how to get to USB with Vol Up and Power but odin stops at "SetupConnection". How can I get a rom installed so I can restore from Titanium Backup?
Thanks
Captivate Connection Issues and Download Mode Help

[Q] Make_extf4fs failed

A friend of mine rooted his S3 mini and installed busybox to try
To edit files that would supposedly get him free internet.
Then his imei dissappeared which lead to a phone with out sígnal.
Then the phone went straight into recovery mode and it pulls up
That Make_extf4fs failed on blk0p25 and blk0p23 errors when i wipe cache and factor y
Reset the phone. I tried flashing a one file stock ROM but the phone continues
To get stuck on the splash screen. Anybody know how i could resolve this??

[Q] Sim not detected, no IMEI

So I tried to install LS-KK-v3.0-2014-05-07-i9305 but the sim is not being recognised and the IMEI has disappeared too
Tried installing OmniROM too and still have the same issue
I've created a backup using CWM recovery and have tried to revert back to this however the phone just gets stuck on the boot screen
Having searched on the internet I came across and he managed to sort out the problem:
http://forum.xda-developers.com/gal...lte-kit-kat-sim-problem-imei-damaged-t2638254
I'm not sure if I should follow this and hope for the best or are there any other ideas
Any sort of help will be much appreciated,
Thanks

Failed to mount '/devlog' (invalid argument) [SOLVED]but boot loop still happening

So my phone was in charger last night and when I woke up, the phone was stuck in HTC logo splash screen. I was curios to see what happened so I tried to force restart but it didn't help. The next thing I did was to enter the recovery to see if there was any problem there. What I noticed was that my sdcard was showing no data on it, so I connected it to PC and mount the sdcard, the sdcard size was suggesting that there should be data on it but there was nothing inside when I tried to open the folder. This was the first time this issue was happening to me.
So the next best thing that I had in mind was to factory reset the phone in TWRP and reinstall the ROM (Xenon HD) and then GApps. Well everything was fine and the ROM booted but since in the latest update of the ROM, root was not present, I went to recovery and installed Magisk 14.0 and then restarted it. After the restart, I notice that the phone boot loops in the ROM splash screen. So I gave it another try to reset my phone but this time only formatting the system like usual way of installing ROM. This is where the issue happened.
Every time I tried to wipe or install anything, at the first and and the end of the log, it states that "Failed to mount '/devlog' (invalid argument)". I thought it was normal and I proceeded with reinstalling the ROM but it won't boot and gets stuck in boot loop. I tried to search for this specific error but in every site, failing of mounting data or system or cache or all of them together with devlog was mentioned but not devlog by itself. I tried many ways suggested in the forums like:
Installing newer version of TWRP
Formatting the partitions to ext2 then reformat to ext4
but non helped.
I really appreciate if anyone could help me figure out how to solve this issue I'm facing. My phone is HTC M7 GSM, S-OFF and the latest GPE firmware is installed.
Thank you
I reflashed my firmware since, when I did getvar, it was showing blank version-main. This solved the error in the TWRP ( /devlog) BUT every time I try to install any ROM, after installation, it shows the ROM splash screen but then it boots loops forever. I tried many ROMS from Lolipop to Noughat all having the same problem. The other thing I forgot to mention after this issue happened there is now a black stagger line under the HTC logo whenever the phone boots. This was not there before and it only happens in that stage of booting.
I appreciate any help

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