Black Screen with flashing underscore when booting from USB

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5

Ok if I understand you correct, then

  1. you flashed a Manjaro ISO to a USB drive
  2. then booted from it
  3. then installed Manjaro to another USB drive
  4. booting works when you boot from CDROM
  5. booting from the usb drive doesn’t work

Since you want to use Manjaro like “persistent USB Drive”, I would suggest to use ALMA (which similar to casper ):