I had the same problem here me out please.
So i rooted my samsung galaxy s2 with this method:
http://forum.xda-developers.com/show....php?t=1125414
then reinstalled the original kernel to get rid of the yellow triangle.
Then I thought it would be best to back up everything before I mess around and i understand Rom manager could do that, so I:
Installed the app,
Selected flash clockwork mod recovery option in rom manger,
Chose backup current rom
it came up with this error:
-- Installing package...
Finding update package...
Opening update package...
Verifying update package...
E:failed to verify whole-file signature
E:signature verification failed
Installation aborted.
So i found this thread which sometime said would fix it on some forum
http://www.inspiredgeek.com/2011/06/...-s2-ii-how-to/
did what it said, went into rom manager selected backup current rom again, and it froze with a yellow triangle and android guy showing. I switched it off and on again then it went through the backup process...
Have I done things correctly?
how can I get rid of the yellow Triangle again and still beable to backup?
Was the freeze screen one moment away from me bricking my phone?
and finally how do I restore the back up I made if anything goes wrong?...
I mainly rooted to freeze bloat ware and get access to certain apps so I'm not planning to do anything drastic.
Thank you for your time.