Try like this:

- go to thread where you download prepusb
- set prepusb the same way as is on picture in prepusb thread BUT set instead of Fat32 to fat and format
- create new empty folder and add name Garmin
- in pre boot flash with this:
Spoiler: 2xx
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- after flash disconnect device from Pc and turn it on
- turn off device and connect it to pc and run webupdater