Firmware version 11.00 has a defect on the Grade %. Flat roads show 24%+

If you are forcing a downgrade in SW, this can wipe your settings, but a traditional update through Garmin Express or Garmin Connect Mobile should not cause this. I will be curious if this happens again, and also if you continue to see this flat elevation graph after you install 11.00 once more. 

There’s no other way to downgrade so settings will wipe.  And you cannot install the same version again - ie. would have loved to reinstall version 11.00 in case of corruption but not possible.  In any case upgrading again now and will see how tomorrow’s ride looks....

Hi am on 11.00 too first ride all went fine, but today mid ride the elevation stopped. it only show gradients between -1 and 2  or 3% also when you are cycling up a hill with 16% gradient. not sure if this is comparable to your issue. it doesn't add the elevation meters up correctly anymore although it shows up more or less correct on the diagram in the App. Have you found a solution for your issue? thx.

After downgrading and re-updating my issue seems to be resolved.  Did a massive test on Saturday see attached.5913791340.zip

On the one hand: strange...
on the other hand: fine for you!

Will you take the risk to update one more time?

Just saw this thread...I'm having a similar issue. While climbing in an area with grades around 3-6% recently I started seeing current grades of 30+% topping out at one point at 46% grade! It only seems to be an occasional glitch, but when it happens I appear to be climbing grades that I am absolutely not capable of climbing. This has only been happening since upgrading to Firmware 11.0. 

That last ride is on version 11.00 so it’s all good now.  Not sure what happened the first time around..