Bricked PX4

Hey,
I have PX4 Pixhawk Lite V2.4.6. It used to work, but after firmware hops between PX4 and Ardupilot it ended up in brick state. I’m able to flash firmware but after reboot it can’t be connected.
When it had PX4-v3 firmware installed I upgraded bootloader. Now when I connect it PC I have further logs:
[518063.344074] usb 1-2: USB disconnect, device number 124
[518065.523276] usb 1-2: new full-speed USB device number 125 using xhci_hcd
[518065.672124] usb 1-2: New USB device found, idVendor=26ac, idProduct=0011
[518065.672127] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[518065.672129] usb 1-2: Product: PX4 BL FMU v3.x
[518065.672130] usb 1-2: Manufacturer: 3D Robotics
[518065.672132] usb 1-2: SerialNumber: 0
[518065.672740] cdc_acm 1-2:1.0: ttyACM0: USB ACM device
[518070.250832] usb 1-2: USB disconnect, device number 125
[518071.679078] usb 1-2: new full-speed USB device number 126 using xhci_hcd
[518071.828510] usb 1-2: New USB device found, idVendor=26ac, idProduct=0011
[518071.828512] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[518071.828514] usb 1-2: Product: PX4 FMU v2.x
[518071.828515] usb 1-2: Manufacturer: 3D Robotics
[518071.828515] usb 1-2: SerialNumber: 0

When it worked It had following logs:

[515492.843552] usb 1-2: USB disconnect, device number 91
[515662.493633] usb 1-2: new full-speed USB device number 92 using xhci_hcd
[515662.642653] usb 1-2: New USB device found, idVendor=26ac, idProduct=0011
[515662.642656] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[515662.642658] usb 1-2: Product: PX4 BL FMU v3.x
[515662.642660] usb 1-2: Manufacturer: 3D Robotics
[515662.642661] usb 1-2: SerialNumber: 0
[515662.643301] cdc_acm 1-2:1.0: ttyACM0: USB ACM device
[515667.164594] usb 1-2: USB disconnect, device number 92
[515667.581585] usb 1-2: new full-speed USB device number 93 using xhci_hcd
[515667.730578] usb 1-2: New USB device found, idVendor=0483, idProduct=5740
[515667.730582] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[515667.730585] usb 1-2: Product: fmuv3
[515667.730587] usb 1-2: Manufacturer: ArduPilot
[515667.730589] usb 1-2: SerialNumber: 310023000951353338353733