CY3125 is Notebook target part number. There are no plan to add USB bootloader for it. We will take consideration on usb bootloader release in future SDK. Thank you so much for your great feedback.
So far, you can use CYPD3123 or CYPD3120 to customize application based on usb bootloader. both of them is support DRP.
Thanks for considering the request.
Advantage I see is that, for some specfic NB application based on CYPD3125 we can avoid USB-I2C bridge from BOM and can reduce the cost.