What adapter did you use to connect the SSD?
I haven’t done it yet. I just found out it had gone to “stable”… will be testing later
found today an amusing thing on Ali …
It’s getting easier to boot pi 4 from usb, but I wouldn’t say it’s totally easy yet.
I see ways with raspberry pi is, but they all need you to download an IMG, then update it and then copy out to the usb device.
I know I tried similar with zynthian distribution and didn’t get it to work yet, so still hunting. Now I have to find yet another sd card (I thought I would be getting rid of these) to burn stock to and test.
And we need something you can script 
Yeah maybe…
There are 2 stages to it basically… Updating your boot firmware (which has now moved from beta to stable, so should become less battle very soon) and updating your os to match.
I have done the firmware trick on (updated) zynthian, and it looks to be ok.
I tried to boot from a fresh image on a base raspian os and it’s elf files are not ready yet. I expect zynthian will be a bit behind raspberry pi os too.
We keep trying.
Come on 
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Aren’t you missing an encoder…?
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Baggypants, thanks for the link. I bought Raspberry Pi4 and Samsung FIT Plus for samples. An excellent bunch turned out …
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Current progress :- I got a lot closer to booting zynthian on pi 4 via usb3/ssd but still not quite there yet.
Booting fine now as per
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Of course this happens just as I get my pi 4 working