I'm using on my S2 a Cyanogenmod Rom (v. 11-20140504-snapshot-M6-I9100) and as recovery CWM-based recovery v.220.127.116.11.
Fortunelly I made a complete backup so I'm able to restore anytime my best configuration with that rom.
The problem come out if, reflashing the stock firmware, I would flash again the recovery and rom. The device do not install twice giving me back ERROR 7.
Do anybodies know why it happens?
I arrived to that configuration flashing CM11-M6 from another CM version (markox89) and recovery v 18.104.22.168 from Philz temporary recovery (and than I flashed the version 22.214.171.124 auto updated to 126.96.36.199).