hello note 2 user...mine accidentally update to 4.2.2 from jellybean i guess...now the battery drain out so fast...i dun know y...its happened since the update..tried to send shop already..they said thy cant downgrade the os...upgrde can lor...need to send to samsung ori dealer..but to far...so anyone got same case like me..anyone can show how to solve?..tried factory reset,but cannot since the update overwrite the old one os..please share the solutionif u know...tq in advanced...