I had trouble with the 7.0 upgrade too.
Prior to the upgrade, no anomalies were found and the system was working 100%.
During the 7.0 upgrade, all the G3X LRUs updated just fine.
The G3X 7.0 update included:
- update to G5 software version 6.00
- update to G5 boot block software version 2.20
However, the G5 did not update, despite power being applied for nearly 30 minutes. It hung up on a boot screen and said "update failed."
Eventually, I was able to install the G5 software to G5 software 6.0 (G3X software 7.0 package) using a standalone micro-SD card with the G3X system power off.
Yesterday I noticed a ADAHRS fail and G5 top ribbon missing labels. Before I could snap a photo it "righted itself". This was on the ground engine off stationary. I've never experienced that prior to the updates.
Long story short, I love the updates that Garmin provides, but I think this latest one is exhibiting a few bugs so I would hold off updating unless you "need to."