Once you realize that none of the above works it's time to take your iPhone to a manufacturer or certified dealer to have it replaced or refurbished.
Ozugbo ị na-aghọta na ọ dịghị nke n'elu na-arụ ọrụ, ọ bụ oge gị IPhone ka a emeputa ma ọ bụ gbaara dealer nwere ya dochie ma ọ bụ refurbrished.