HELP, HTC ONE M8 stucked with a custom recovery and no root!

a few months ago i decided to return stock to get the OTA update for lollipop, everything went good but the OTA update for 4.4.4 can't be installed I don't know why, after some attempts i got a custom recovery without the root impossibilited to return to stock recovery and with the 4.4.3 kitkat and 2.22.401.5 firmware... if someone can help me i'll appreciate

Phone not botting up, stucked in samsung logo

Hello,
my s4 i9500 not booting up any more just got stucked in logo and then powered off..
I tried to flash recovery and full rom but in odin the process stops in initialization step and not moving forward and also in download mode no progress bar showing up... I tried many cables but same result with all..

I went to service center too and they said the pcb is dead but how as samsung logo is showing up and download mode is available..?

Please, help me to get it fixed...