i have been through all the related posts about same situiation in different devices . and now im HIGHLY CONFUSED ! i'm in procedure to install MIUI custom ROM to my samsung galaxy s2 ((BUILD-gingerbread.xwkf3, kernel-22.214.171.124-I9100xwkf3-cl276555 ROOT@DELL101 #2 )) what the sequence i have followed till now- 1] replaced kernel with insecure XWKF3 kernel using odin3-v 1.85 2] used S2Root 1.4.3 TO root my phone 3] downloaded ROM manager, Titanium backup . did titanium backup of my applications successfully 4] tried to use ROM manager for nandroid backup, >> flashed clockworkMod recovery. then selected reboot into recovery and what i see Installing oackage finding update package... opening update package... verifying update package... E:failed to verify whole-life signature E: signature verification failed Installation aborted i rebooted phone, using the option mentioned there PS-i see no option for backup and recovery to select with volume up and down keys as mentioned in procedure 5] I replaced my insecure kernel with original one related to my build 6] i tried again with ROM manager , same condition 7] used quick root to start into recovery page , its successfully applied multi-CSC , but still i see no option for backup and recovery now i have read certain posts, and they have given solutions, that i can't understand a bit i can't stick the links as its my 1st post but the have given the solutions like >>>HI, this is because your now running the 3e recovery, look into the cf-root kernal, this includes root and the 2e recovery. This will fix it for you. You will also be able to add a lagfix to your froyo aswell, I myself use this kernal >>.have u try to copy downloaded ROM to Internal Storage? then reboot to CWM and install zip from sdcard>choose directory. >>>.I fixed that problem. Simply select apply sdcard:update.zip Then reboot Open Root Manager Select "Backup Current ROM" (may be you should reboot) Thats all. Goog luck! i thing the last one is the solution, but im not sure if i should do it or not, will i lose my data? what does this option actually mean ? i have no idea what is CF-root and update.zip where is internal storage , whats sd card, and how to mount sd card to phone and many other terms, im hella frustrated now please do something !