[CA] Updating C127

It's about a clear as mud to me about updating my c127 mfd.
Version this machine is running now is 3.15.

Need update to run a blue tooth display on my Android cell, or tablet.

Know this update can only go on a 32 gig micro SD card. After that
the instructions look conflicting. Part that worries me is ruining
my display with the line: "responsible for damage."

Please help and thanks for any assistance.

Have downloaded the version 19.3 that loaded with a lot of files after
it's unzipped. Many apply to other systems/products.

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