If you only want to update your unit and not the GLS10 simply turn transducer off at the unit.
Update the unit and not the GLS10.
I have most recent update in my 1222 v26.20 and 2.57 on GLS10 with zero issues.
Just have to play with the settings

2.55 v2.57
Added Auto Ghost Reject option.
Improved sunbeam reduction.
Good luck.



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