Upgrade to raspberry Pi 4

[gesucristo]

Hello everyone. I couldn't find this in the forum nor in the documentation, hope I didn't miss it.

I was happily using recalbox on a raspberry pi 3B+.
I now got a Pi4 and discovered that the very same SD card won't work on it.

I then realized that for Pi4 there is a separate image.

How can I upgrade the image so that it can run on a raspberry pi 4 without needing to reinstall everything (and copy roms and all my customizations and the like)?

Thanks so much.

[sroach]

You'll want to look at moving roms, bios, configs to external usb storage. This will allow you to re-image the MicroSD card with pi 4 image of 7.11 and then when you plug the usb back in and point to it in storage settings your roms and bios's will be there.

[gesucristo]

Yup, thanks for your reply. Unfortunately what you suggest is actually what I hoped to avoid: I have no extra storage for those ROMs other than the SD where they are right now.

Also I made some bootcmd customizations, and other tunings as well, so I hoped to be able not to do everything manually again.

So the only alternatives a far as I have understood are buying a new SD card and moving all the settings or sticking with Rpi3, right?