BSL write check error

Hello Champs,

Ve customer tries to upload 256 bytes at once to FR4133 starting from address 0xFF10.  When they perform attempt to write data from external MCU, they get response 0x3B 0x01 (BSL Core Message, Flash write check failed, CRC doesn't match). When they try to write the same data from address 0xFF00 everything is OK (response is 0x3B 0x00).

Are there any limitations on address fange, etc. on FR4133?

Best regards,

Ilya