This "unable to save image to flash memory" error is a known Aerohive/Extreme HiveOS issue that shows up repeatedly on old firmware like your 6.1r1, usually because the AP is still using TLS 1.0 to talk to the cloud (which was disabled on the cloud s...
I have encountered similar issues when upgrading between major versions. If the upgrade process freezes at 3% during the "Verify image" stage, I would recommend checking the image integrity, available storage, and system logs for any verification-rel...
