I just received a raspberry pi 3 B+ this week that I ordered from Newark. I am using it to build another battery capacity test data acquisition + analyzer. I love the pi’s SD card copier accessory. I used it to burn an exact copy of the image I have on a working analyzer to a fresh 8GB SD card. This is particularly useful on this project because I have so many special packages, file systems, daemons, and configuration options set up on this pi, and wanted an exact copy. The one I copied it from was running on a pi 3. I put the SD card into my new pi 3 B+ and fired it up.
The power LED had a regular blinking pattern; three short, four long – if I remember correctly. At first I thought I had a bad pi out of the box. I then began to suspect the SD card. It was the cheapest class 10 SD card I could find on Newark. I put it into a pi 2 and it booted up just fine, so that wasn’t it. Lo, and behold the pi 3 B+ will not run on raspbian jessie; it must be stretch running linux kernel 4.1.
I downloaded the latest version of raspbian stretch, reformatted my SD card to a FAT file system, and used etcher to burn the image to the card. Put it in, fired it up, and bam! It started up just fine. Bad thing is I will have to manually configure everything from scratch.