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I heard that some customers bought pre-programmed PSoC4. So I think it is possible.
In my opinion, if the pre-programmed PSoC4 was programmed with application firmware. It is not very flexible to upgrade the firmware.
If there is a host mcu in your design, you can try to use bootloader+bootloadable. Using a pre-programmed chip with bootloader is easy to upgrade your application firmware.
Suggest to contact your local Cypress distributor sales/FAE to confirm.
Here is CY distributors list:
Many thanks for the support.
I'm developing now a bootloader that uses an external SPI memory interface. I guess that in a few days I’ll have a functional bootloader in hand.