**Not mandatory.** Only needed if a VSCP boot-loader algorithm is used.

A node failed to program a data block. This event has no meaning for any node that is not in boot mode and should be disregarded.

 | Data byte | Description              | 
 | :---------: | -----------              | 
 | 0         | User defined error code. | 
 | 1         | MSB of block number.     | 
 | 2         | Block number.            | 
 | 3         | Block number.            | 
 | 4         | LSB of block number.     | 
