This may be an issue due to the current version on the panel. Can you try updating incrementally? Try updating to 2.5.3 first using the steps here:
Then update incrementally in this order: 2.6.3 > 2.7.2 > 2.8.1
Does that work?
This may be an issue due to the current version on the panel. Can you try updating incrementally? Try updating to 2.5.3 first using the steps here:
Then update incrementally in this order: 2.6.3 > 2.7.2 > 2.8.1
Does that work?