[Galaxy S II Q&A, Help & Troubleshooting] kortik:
Hello,

I am flashing roms since nearly two years and I got my first big problem 2 days ago.

My GT-i9100 (DBT Germany) was running stable under cm-12.1-20150611-UNOFFICIAL-i9100.zip brought by Lysergic Acid.

When I tried to log on WLAN on Tuesday morning, my rom crashed with a few percent of energy remaining. I charged my battery and started the phone again. I had a message "No Service" and a barred circle. Pin Code was being asked, as well as my lock screen Pin Code.

I thought it was a mobile network operator issue, and that it would be temporary. Didn't care about it, I was able to log in my WLAN network. Then I saw an update (06/17) on xda, that I downloaded and flashed following the installation instructions. I noticed still the "No service" message and the circle barred. I looked at my telephone settings an saw Unknown Baseband, No Signal, Unknown Imei. When I called *#6#, there was a popup with only the Text IMEI no number.

Finally I did sthg really stupid (I didn't google Unknown Baseband Unknown Imei at this time), because I thought wrongly that the issue is a rom, modem or csc issue. Then I decided to flash back to a stable jelly bean version.

Thus, I had to flash the partition with Stock i9100 pit, because I was using a preload modified area partition before.

Then I made my great mistake, that's what I think now, I think I corrupted my /efs folder. I installed a stock firmware from sammobile on my SII (still no service, unknown baseband), then rooted the phone again, and installed

ASNET MIUI v5 (4.8.10) everything is working except this my mobile network unknown baseband, unknown Imei, etc

I tried to look on my external harddrive, if I had any backups from my phone, did not have any /efs backup. :crying:

With root explorer I am able to to see the /efs folder no file is missing I think, but it is certainly corrupt. I am joining a .tar file of this folder here. https mega.nz/#!4IZijDTK!2eZ1lhC01bTEcbzwP7OVe8tePiIm5GNQ_dwpZRZHF0k

~ $ mount

rootfs on / type rootfs (ro,relatime)

tmpfs on /dev type tmpfs (rw,nosuid,relatime,mode=755)

devpts on /dev/pts type devpts (rw,relatime,mode=600)

proc on /proc type proc (rw,relatime)

sysfs on /sys type sysfs (rw,relatime)

none on /acct type cgroup (rw,relatime,cpuacct)

tmpfs on /mnt/asec type tmpfs (rw,relatime,mode=755,gid=1000)

tmpfs on /mnt/obb type tmpfs (rw,relatime,mode=755,gid=1000)

none on /dev/cpuctl type cgroup (rw,relatime,cpu)

/dev/block/mmcblk0p9 on /system type ext4 (ro,relatime,barrier=1,data=ordered)

/dev/block/mmcblk0p7 on /cache type ext4 (rw,nosuid,nodev,noatime,errors=panic,barrier=1,journal_async_commit,data=ordered)

/dev/block/mmcblk0p1 on /efs type ext4 (rw,nosuid,nodev,noatime,errors=panic,barrier=1,journal_async_commit,data=writeback)

/dev/block/mmcblk0p12 on /preload type ext4 (ro,nosuid,nodev,noatime,barrier=1,data=ordered)

/dev/block/mmcblk0p10 on /data type ext4 (rw,nosuid,nodev,noatime,errors=panic,barrier=1,journal_async_commit,data=ordered,noauto_da_alloc,discard)

/dev/block/mmcblk0p4 on /mnt/.lfs type j4fs (rw,relatime)

/sys/kernel/debug on /sys/kernel/debug type debugfs (rw,relatime)

/dev/block/vold/259:3 on /storage/sdcard0 type vfat (rw,dirsync,nosuid,nodev,noexec,noatime,nodiratime,uid=1000,gid=1015,fmask=0002,dmask=0002,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro,discard)

~ $ su

root@android:/ # #

root@android:/ #

root@android:/ # df

Filesystem 1K-blocks Used Available Use% Mounted on

tmpfs 422816 76 422740 0% /dev

tmpfs 422816 0 422816 0% /mnt/asec

tmpfs 422816 0 422816 0% /mnt/obb

/dev/block/mmcblk0p9 516040 453384 62656 88% /system

/dev/block/mmcblk0p7 100784 4160 96624 4% /cache

/dev/block/mmcblk0p1 20144 10492 9652 52% /efs

/dev/block/mmcblk0p12

516040 77688 438352 15% /preload

/dev/block/mmcblk0p10

2064208 306208 1758000 15% /data

df: /mnt/.lfs: Function not implemented

/dev/block/vold/259:3

12063840 445792 11618048 4% /storage/sdcard0

1|root@android:/ # mount /efs

mount: can't read '/etc/fstab': No such file or directory

1|root@android:/ # mount /data

mount: can't read '/etc/fstab': No such file or directory

1|root@android:/ # mount /preload

mount: can't read '/etc/fstab': No such file or directory

1|root@android:/ # mount /cache

mount: can't read '/etc/fstab': No such file or directory

1|root@android:/ # mount /system

mount: can't read '/etc/fstab': No such file or directory

I still have the IMEi on the back of my phone.

Is there a way to fix this or is it impossible?