I finally found the schematic of this kit on page 82 of CY8CKIT-042-BLE_KIT-Guide.pdf
I found the pin Vin connected 4V. But didin't expect, that this kit supports only 3v3 and 5V supplies.
I thought, that removing J16 jumper switch into Vin. I was wrong - it switch into 1.9V
So removing the jumper damaged the board. Remember either don't buy or don't remove the jumper
In my case externally supplied power to pins damaged the chip.
Supply through Vin is not possible in any case because, the usb connection is needed for debugging.
And VBUS from USB (5V) has precedence over Vin if Vin is lower ( my case).
For me it's a big mistake in board design
I think the only solution to work with arbitrary Vin is to remove BLE board from it's motherboard, and work separately with dedicated programmer.
But this solution is not what the kit was intended for. It's like washing machine without motor.