There is now a firmware update.
“The firmware update will not change or recover any rides completed between August 17 and when it is updated. For information on recovering or changing ride dates, see Retrieve / change ride files from ELEMNT, BOLT 1, or ROAM 1 from August 2025“
There is a software bug affecting all V1 Wahoo BOLT and ROAM GPS units.
They used a 10 bit un-signed counter for counting weeks since Jan 2006. That was 1024 weeks (close to 20 years) ago and the counter wrapped around!
My last four rides were dated Jan 4, 5 and 6. Wahoo has a fix, but it is being tested over the weekend.
More detail here.
I was able to fix mine using the on-line fitfiletools.
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