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We are getting the error “Transfer Invalid” while upgrading the BMXCPU2020 firmware. It also says Invalid access.

The error of “Transfer Invalid” is generated because of corrupted memory card in the M340 CPU.
The best way is to format the M340 CPU memory card and then try for the firmware upgradation.
Follow the below steps to format the CPU memory card.
Formatting or clean up is possible only in Stop mode:
  • %SW93.0 = 1 a rising edge starts the format operation.
  • %SW93.1 gives the file system status after a format or a clean Up operation request:
 %SW93.1 = 0 invalid file system or command under progress,
 %SW93.1 = 1 valid file system.
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