@korczynski
The GPS 25 series devices are all updated via serial com port. You can do it yourself if you can find a serial cable and an old PC to work with. Likely a serial to USB adaptor will also work with a later PC. The software update comes in an EXE file and if you first extract it with 7-Zip or similar you can find an informative README.TXT file and also an UPLOAD.BAT file for use in DOS mode Command Prompt. The are also instructions shown on the Garmin software download page:
Code:
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