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UBX Class UPD
This class is used to update the firmware.
UPD – DOWNL (0x09 0x01)
It is an I/O message. It is used to download data to memory.
Header ID Data Length Data Checksum
0xB5 0x62 0x09 0x01 8+N*1 See below CK_A CK_B
Data
Offset bytes Format Descriptions Notes
0 U4 Download starting address
4 U4 Flags 0 – download
1 – download ACK
2 – download NACK
The following data will be repeated N times (depending on the length of data).
8+N*1 U1 Data
NOTE: A block of data may be downloaded to memory by implementing several
UPD-DOWNL messages. The starting addresses are increased for the following
UPD-DOWNL messages based on the already transmitted bytes.