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Downgrade steps to v10.40.

After upgrading the firmware to v12.0 for my Garmin 745 and not having the elevation issue fixed, I downgraded my watch to firmware v10.40. I see many posts asking how to do this, so I thought I would post the information here for the benefit of others.

Go this URL and download the beta version: https://www8.garmin.com/support/download_details.jsp?id=15459
At the bottom of the page, follow the instructions shown in steps 5 on how to downgrade from the beta version back to the original firmware.

Note, you need a PC to do this work. I could not access my Garmin on my Mac. You will loose all of your settings, but I thought it was a small price to pay to get the proper elevation readings during my runs.

Good luck. As always the steps mentioned here worked for me. Hope they help.

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0 JS over 1 year ago in reply to Lukas

Hi, I did in fact downgrade my FR745 a few weeks ago from 11.60 to the 10.40, and the results have been really good -the accurate elevation tracking during my activities was back to where it was before July 2022.
Please note that I have no idea if/how this works when downgrading from SW Versions after 11.60 (12.xx etc.). The downgrade entails renaming and placing certain files from the attached zip file in certain folders on the watch (via Windows-Explorer). A bit of googling garmin beta downgrades can show the general process.
The watch will reset and need similar to new (cadence new calibration, sensors new adding, data screens re-configuring, etc.). However, I am glad I did this for now. When the newer updates get solid reports, I would definitely go back to the newest version, but until then I will stay with 10.40.

Forerunner745_1103Beta.zip

0 Lukas over 1 year ago in reply to JS

thank you so much!! I did a downgrade (with no problem) turn off auto updates, really looking forward for tomorrow run.

i also noticed my problem with elevation is also in forum FR945 - https://forums.garmin.com/sports-fitness/running-multisport/f/forerunner-945/329345/altimeter-inaccurate-after-update-to-v12-1

so we just have to wait for garmin identify and fix the issue. Meantime, thanx for 10.40

0 maratonrunner over 1 year ago in reply to Lukas

Looks same issue I mentioned in another thread Sudden altitude drop during activity ~ three weeks ago. Also same/similar issue in 945 thread Altimeter inaccurate after Update to v12.1?. Before the altimeter has worked almost perfectly, but recently the watch shows that I run uphill for the first kilometer, when in reality I run downhill. Total elevation is ~*3-4 actual i.e. very unreliable.

0 Lukas over 1 year ago in reply to maratonrunner

yup, its really frustrating. Today's trail run, great elevation data as you can see on picture.

Up - FR745 v10.40

Down - Elevation correction

so, garmin, it's up to you, because beta 12.52 has still altimeter trouble