Keyboard support firmware PSoC4_CapSense_I2C_BLE_MCT88 should be used only for devices:
MCT80M-BLE v1.x Rev.A - Rev.D

Keyboard support firmware PSoC4_CapSense_I2C_BLE_MCT88_CY9C4128 should be used only for devices:
MCT80M-BLE v1.x Rev.E or higher