Rolling SW back on a Garmin
This is for those tech-savvy Livescope users who want to try rolling back to a previous version due to the livescope quality issue in the last "perspective" release (GLS10 version 2.30). I assume no responsibility whatsoever if you brick your devices. I am an electrical engineer with many years of experience in HW and SW development, so tech topics are easy for me.
It is completely possible to roll your software back to a previous version - if you have the correct update bundle file from Garmin for your unit. Garmin publishes the procedure on their website "Performing a Forced Update", and a link to the procedure was given to me by Garmin support when I called in to report I have the PLS issue. It is a safe procedure, but only if you have the correct file! Unfortunately, Garmin will not provide older SW files.
I always used AC to update mine, so I did not have the previous file, but I was able to find someone who had it by posting on bbc.com Garmin forum. Ideally you get the most recent one prior to the last "perspective" update. Garmin makes three flavors of update bundle file: GPSMAP, legacy GPSMAP, and ECHOMAP. If you go to support page for your model, chose software, and you can click a link to see a list of models each file includes, and verify your model is on that list.
When I got the (ECHOMAP) file, I unzipped it to an SD card. The only root folder is "Garmin", and in the folder there should be a single file named GUPDATE.GCD, and a single folder named "updates". DO not use your AC card for this - get another card. I used an 8 GB card I had laying around. Once you have this SD card set up, you can follow the update procedure. Note: I assume NO RESPONSIBILITY for anything that goes amiss if you try this. Proceed at your own risk.
For my Ultra 102sv and Livescope, with the unit OFF, I simply removed the AC card, put in the update card. Note: you need to keep the network cable connected to the GLS10 module and have it ON if you use a switch - I don't use a switch. Then I powered up by holding the power button down until a message "Forced loader recovery" or something like that appeared after 10-20 seconds, and released the button. This is the procedure for the Ultra - your unit may be different. Then I let the unit do it's thing. It updated the Ultra, then after a while another screen came up, and it updated the GLS10 "black box". It worked perfectly, and my unit was rolled back to the previous release versions 10.0 for the Ultra, and GLS10 module version V2.20. I have not tested it thoroughly due to weather and work, but it seems to be just as it was before the perspective upgrade.
HTH, and good luck. Definitely call Garmin and start a support case for your unit if you have the PLS issue.
