G2 Fastboot mode

My phone is bricked, it boots on fastboot mode, when i plug it to pc it shows this lines:
fastboot mode started
-reset-
-portcharge-
-reset-
-portcharge-
fasboot: processing commands

when i try to go into download mode it works for few seconds then go back to fastboot with the same lines
when i go to recovery and try to delete everything it works then boots into this fastboot mode again and pc won't recognize it help me please