HELP, phone not loading and can't get into recovery

hi all,

i had cm-12.1-20151004-UNOFFICIAL-i9105p installed and working, but due to some apps crashing, i decided to switch back to cm-12.1-20150912-UNOFFICIAL-i9105p.

i erased the cache and installed the above mention ROM, but now my phone stuck on the bootup animation and I can't even get to the Recovery to undo the installation.

any help?

thanks, eli