Is there any frequency constraint for msp430f5438A device when calling BSL

Hi,

    I'm using msp430f5438A device right now, and i want to update program by BSL in the device. I found that when the MCLK is set as 24MHz before calling BSL, the new program cannot be download rightly, but when i set MCLK to 12MHz or lower, BSL works well and new program can be loaded correctly. I noticed that in the document MSP430 Programming Via the Bootstrap Loader(BSL) there is one note in page 30:

    The BSL on MSP430FR58xx, MSP430FR59xx, MSP430FR68xx, and MSP430FR69xx must
be executed with a maximum frequency of 8 MHz. If the device operates at frequencies
higher than 8 MHz, the MCLK frequency must be set to 8 MHz or lower before calling the
BSL.

  So i wonder if there is also similar frequency constraint before calling BSL.

  Thanks!

Richard