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Questions regarding 0x07 (Installing a firmware file)

Hello,

To make things easier for our artists, I created a small GUI utility to replace the splash screens, and I'm now looking to implement a button to upload the new binary to the LightCrafter.  From the "Command Interface Guide" documentation, it appears 0x07 is the way to go for this. 

However, I have questions on how exactly 0x07 is meant to be used before I accidentally brick the LCr!

1)  Byte 4 to Byte 35 -- does this string require a specific format for the version number?  Or can it be anything?

2)  37-39 are reserved.  Can I just put 0 into these bytes for the write payload?

3)  80-83 is the 32bit checksum of the first file...  what algorithm should be used to calculate the checksum?  Just add up all the bytes in the bin file?