dragonrider33

hi friends !! I'm having a reliance cdma of nokia 2112 now my mobile is getting switched off and wont turn on for hours.If it turns on again and it turns off back.. i had contacted the dealer and he said he has to upgrade the software.... can you help me out this problem ?? The battery is in good working condition. where can i download the firmware or software ? how can i upgrade it ? which cable i have to use for this ? can you please let me know !! thanks in advance !!