@Alexey-Gaponov Looks like you have a flat battery.
Google on how to revive a flat battery.
But to start with try the basic: charge it, plug out and in, check the temperature of the phone… just desperately try to get some juice into the phone! Use different chargers and different cables.
@Alexey-Gaponov I don’t know exactly, there isn’t enough information to know.
But a flat battery can give you the impression of … having a dead phone or partly dead phone.
Try to cure a flat battery and if that doesn’t work, let us know and figure out something :)