Usually people would clear the system cache after an OS update (factory reset is the best idea). Can you explain what the differences are with the old version and Oreo? 1. Is there an option to change the screen resolution? 2. Are there any features REMOVED or changed? Such as data on/off toggle shortcut. 3. Any reason you find not to upgrade? (Slower performance, battery drain, ugly UI changes, etc.)
1. No, not that I can find. You can adjust the grid size, which I can't remember if that was there before.
2. No features removed as far as I can tell. Data on/off toggle is still there.
3. Battery life remains to be seen. Performance was laggy for a little while after update but seems smooth now. I like the UI changes. You can change the shape of the icons now. Also, you can long press on certain icons and quickly access certain features. For example, I have 4 separate email accounts and when I long press on my email icon, a small menu pops up that lists all the accounts so that I can go directly to a certain one. There's also "Compose" that when I select, takes me directly to a new email.
Also, my bluetooth seems to behave better with my car stereo. Seems some of the connect/reconnect problems I had been having might be solved now.