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Open Core doesnt show second boot drive

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I had clover working with an internal NVME and an external USB SSD both running Catalina. I installed open core and updated the NVME install to Big Sur. It worked, but now my external SSD with Catalina doesnt show up as a boot option (but it is visible in finder and disk utility when I boot into Big Sur). Does anyone have a fix for this?
 

Edhawk

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Have a look at this section of the OpenCore Troubleshooting guide - # it shows how to resolve not seeing bootable partitions.
 
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