1. Boot the SDRplay SD-card in the non B+ device as normal.
2. Open Terminal Window
3. Run...
sudo apt-get update
sudo apt-get upgrade
sudo rpi-update
This will make the SD card bootable on the Raspberry Pi 3 B+
Another thing I noticed during testing was the power consumption for the B+ is higher than previous models so make sure you have a good PSU. I tried a few 2A supplies that didn't work, but a good 2.5A power supply worked fine.
We'll make an announcement as soon as we've got the image updated for the RPi 3B+
Note: for those into different SBC devices, you might want to try out the Odroid-C2 as with full Gigabit Ethernet support - I could get 10 MHz bandwidth remotely using SoapyRemote to my PC pretty easily. Low CPU load as well. It does need some forced air cooling in my opinion
Best regards,
Andy
Software Development