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For some reason it has lost the ability to recognise the SD card slot and so only tries to boot from the eMMc memory. The log reports "SdmmcInit=2 0" no matter what SD card I have in it. I have three that "were" working, now nothing.  
 
 
I decided to try wipe and reflash. I was able to update the rk3399_loader_v1.27.126.bin for the loader but can not find idbloader.img nor u-boot.itb. Where are these files located? 
 
this pi 4 has been working solid for two years now and all I did was try another SD card that may not have had a valid opsys on it. Now, it won't boot from SD at all. 
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