“Unfortunately, despite upgrading (with sudo apt-get update & sudo apt-get upgrade) to the latest version of Raspbian, I still got the under-voltage lightning bolt icon when I tried to boot the Pi with the official screen & power supply with a bluetooth keyboard, so I can't use this arrangement with the faster CPU etc..
Works absolutely fine with a standard monitor. Nice improvement in speed over the 'old' Pi 3 & dual band wifi.”
“After further digging around, changing power supplies (including using separate ones on both the RPi & the screen's own board), keyboards etc., I discovered that, despite updating the OS as described in my previous post, it still wasn't the latest version or anything like it. Not sure I fully understand why!
I eventually created a new image & it now works perfectly on the official screen.”
“The first time I tried to fire up my Pi 3B+, it wouldn't boot and it kept sticking on the "rainbow screen" (whilst also displaying the undervoltage [lightning bolt] icon), after a search of the raspberrypi.org forums I found out that I was simply using boot code that was too old! I downloaded the very latest version of Raspbian and it then worked a treat! Now very happy with the improvement in performance - most noticeable for me so far in the increased speed of web browsing.”
“At first I couldn't fit the 3+ into my Flirc case (pi3 version) as the supplied thermal pad was too thick to accommodate the new CPU lid. I removed the pad and applied some thermal paste and it fits perfectly. CPU temps didn't go above 65'C even with all 4 cores pegged to 100% for 2 hours (CPU stayed at 1.4Ghz). Increased wifi and Ethernet speeds are a welcome addition. Good job.”