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Go to the platform makefile and replace HSE_VALUE with HSI_VALUE and provide the internal oscillator frequency of the host processor.
I changed GLOBAL_DEFINES += HSE_VALUE=26000000 to GLOBAL_DEFINES += HSI_VALUE=16000000.
It does not work. The baud rate is bad and I lose my serial port.
Do I need to change something else?
Shouldn't matter, but the external oscillator is still installed.
Please check the PLL settings, crystal selection made in platform.config.h. To understand the clock organization, please check 43xxx_Wi-Fi/WICED/platform/MCU/STM32F4xx/peripherals/libraries/system_stm32f4xx.c.