I can't make it work

[maddrugamers]

only the phrase appears on the sd2psx display:
fatal error psram id is not know die expected od 5d sot 00 00
try to power-cycle it is psram is stuck in the api mode

How do I resolve this? Has anyone ever experienced this?

[xyzz]

It means you have a fake or broken PSRAM chip, please see the note here https://github.com/sd2psx/pcb#psram-notes-ly68l6400slit

[WaitWhat4355]

When assembling a bunch, I had the same issue appear for a few, but the cause was one of the PSRAM's pins being off the pad. Sometimes imperceptibly, needing my digital scope to see it. I know it's been a year, but maybe you still have it around.