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Take a look at these two guides to get you started, or as a reference in case you forget something:
Updating Wispr Ground Control
Updating Wispr Flight Firmware
What steps should I take if the maps appear as a plain white screen, lacking the actual map content?
Please attempt to connect your controller to a 5GHz hotspot, such as your phone (ensure your phone or any hotspot you choose is emmiting 5GHz), as a potential solution. It is important to note that this is not a guaranteed resolution, but it may assist in resolving the issue.