Re: Error during generating a USART bootloader using MPLAB harmony configurator.
Personally I avoid BSP's since I started using Harmony2, they are unnecessary since have MHC pin Manager.
1. Generate with the UART Bootloader enabled in MHC, backup the project.
2. Carefully Comment out the error lines with references to BSP. Optionally replace them with your own code that gives similar functionality for your board (monitor a jumper or switch or data variable).
*. Custom Bootloader or using Microchip's UART bootloader is good enough for you?
If Custom then Disable Bootloader in MHC, and put back the linker file (*.ld), available in zip
Disabling the BL in MHC will stop if from Re-adding the BL files from libraries
Then you can replace those BL files with your own BL.