Help everyone

my phone cant switch on normally, i was trying to install custom rom, i booted into recovery mode and i back up system data incase of any mistake, but the custom rom did not install, so i was unable to boot into recovery or downloaad mode since then but my phone was still working properly, and later i was trying to fix that recovery and download mode at booting up, so i donloaded root explorer and i entered into system/bin and i deleted everything that is there thinking those files are responsible for me not to boot to recovery or download mode, after i have deleted it, i switch off my phone and switch it on, but the phone only display samsung logo aand switch off back. Problem is that my booting file at system/bin all have been deleted and no booting file there to enable the samsung to boot properly. booting file is missing but before deleting that files, i have full system back up, so since i cant boot into recovery or download mode on samsung GT 19082, is there a way i can reinstall that files i deteled from system/bin folder or is there a way i can restore the backup file since i cant boot into recovery r download mode so that everything will work well again? Thanks alot for your help.
SAMSUNG GALAXY GRAND DUOS GT 19082.