[Nexus 5 Q&A, Help & Troubleshooting] bitdomo:
Enter recovery and try to use this command to fix persist partition:

persist is a ext4 partition containing your bluetooth and wifi MAC address and some drm kind of stuff. If persist gets corrutped then your phone acts like that. Formating persist will solve your problem but you have to fix your wifi and blueatooth mac address. Losing those drm files not caused any problem yet, maybe it is the same for everyone but I still dont know unless someone make md5 checksums of those files, then those drm files could be restored from other devices if they are the same.

if e2fsck fails, then backup your persist partition with this command:

then copy it to your pc by adb pull

Send it to me and I will try to recover any data through hexediting or you could do it by yourself if you can do it.

If we fail to recovery anything then use this command in recovery to format persist:

Then follow my guide here to fix wifi and bluetooth mac address.

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Can someone make a md5 checksum for the files on his persist partiton?

A complete list with the files I have on /persist

.:
drwxrwx--- bluetooth system 1970-01-02 01:02 bluetooth
drwx------ root root 1970-01-01 01:00 lost+found
drwxrwx--- system system 1970-01-02 01:03 playready
drwxrwxr-x root root 1970-01-01 01:00 sensors
drwxrwx--- system system 1970-01-02 01:03 widevine
drwxrwx--- wifi system 1970-01-02 01:02 wifi

./bluetooth:
-rw-rw---- bluetooth system 6 1970-01-02 01:02 .bdaddr

./lost+found:

./playready:
drwx------ system system 1970-01-02 01:03 dxhdcp2

./playready/dxhdcp2:
drwx------ system system 1970-01-02 01:00 acGSIRU1TX-2o-nJ69e1aFGgUxE_

./playready/dxhdcp2/acGSIRU1TX-2o-nJ69e1aFGgUxE_:
-rwx------ system system 1072 1970-01-02 01:03 etK7oituoft7bxrO5H7GIVuhEQM_
-rwx------ system system 1072 1970-01-02 01:03 mUiE28tHgFkv4U6m-ynqfIBPCn8_
-rwx------ system system 1072 1970-01-02 01:00 zttE+GVYd9YzREzMHiKY-IlERZM_

./sensors:
-rwx------ root root 12288 2014-05-05 11:30 sns.reg

./widevine:
drwxr-x--- system system 1970-01-02 01:02 5dsokxEEDXgQhkN50bp-Z2K5InM_
-rw------- system system 4 1970-01-02 01:03 index.txt

./widevine/5dsokxEEDXgQhkN50bp-Z2K5InM_:
-rw-r----- system system 1072 1970-01-02 01:02 D3qpp0bxmJhbiZwIsCbXJ1434rc_
-rw-r----- system system 1072 1970-01-02 01:02 RXFABDUxyT6Q+Zwx9ZhPGOq2Bq8_

./wifi:
-rw-rw---- wifi system 6 1970-01-02 01:02 .macaddr

MD5 for the files

fe0fde89ea3ef11d3b6edb0dbbb2c12d *persist\playready\dxhdcp2\acGSIRU1TX-2o-nJ69e1aFGgUxE_\etK7oituoft7bxrO5H7GIVuhEQM_
66c3157aa20a19acee046b476432e160 *persist\playready\dxhdcp2\acGSIRU1TX-2o-nJ69e1aFGgUxE_\mUiE28tHgFkv4U6m-ynqfIBPCn8_
4fede9b63a7092418bd802b648590396 *persist\playready\dxhdcp2\acGSIRU1TX-2o-nJ69e1aFGgUxE_\zttE+GVYd9YzREzMHiKY-IlERZM_
136dcf807a1ddd233a642b4f449ff007 *persist\sensors\sns.reg
88254b8586ae2f885365bcdd3eab0ac6 *persist\widevine\5dsokxEEDXgQhkN50bp-Z2K5InM_\D3qpp0bxmJhbiZwIsCbXJ1434rc_
b497cbe70350788434984967be4dc740 *persist\widevine\5dsokxEEDXgQhkN50bp-Z2K5InM_\RXFABDUxyT6Q+Zwx9ZhPGOq2Bq8_
7c6658fbc6d0d7d4030b482405afe35a *persist\widevine\index.txt