Downloading data from unresponsive MX2201

For our sea turtle nesting monitoring project we have a number of MX2201 deployed in a beach environment. A large percentage (about 10%) of the HOBOs have become unresponsive to Bluetooth connection. At best we get a Readout Error code 1042, but in most instances they don't appear to be able to go into a responsive state (no response to the button). Can you please help with indications on how to rescue the data, at least?
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