Upgrading from Pi 3 B v1.2 to 3 B+, SD not booting
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Hello! I have a pi 3 B v1.2 with a 64BG SD card. I have put a ton of time into getting all the settings the way I want them. I recently bought a 3B+. I ran apt-get update/upgrade, dist-update/upgrade, but no luck when I put the SD card into my B+.
The B+ gives me a rainbow screen and lightning bolt. I know this usually indicates a bad power supply but I am using an official power block that has always worked for me on my 3 B. Also, I tried a fresh install on a different SD card and it worked fine on my B+. What do I need to do to get the SD card that works great on my 3 B working on my B+?
Thanks!
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@aschwan just transfer the files over. It's not a simple process to upgrade the OS.
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I just went through this myself.
My Pi 3 B image was started as a 4.3 and then upgraded to 4.4, but when I put that in the 3 B+ it would not boot.
It turns out that Raspbian had to be updated to support the 3 B+, this updated core is called Stretch, where the old core was called Jessie.
https://en.wikipedia.org/wiki/Raspbian#Version_history
The 4.3 image used Jessie and the 4.4 image uses Stretch. However, updating from 4.3 to 4.4 stays on Jessie, which is why mine wouldn't boot.
I read that you may be able to force to 4.4 Jessie to a 4.4 Stretch, but general advice is to do a brand new 4.4 Stretch image. This is what I did and mine booted up fine.
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@jjack229 @herb_fargus Thanks for the replies!
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