USB help new versioms

Hi I need help i have just installed the new version number 5 but it is not being deceted on the boot menu but older versions do work please help.
Thank You


Are you saying you installed (or imaged?) Parrot on a USB drive, but your BIOS\UEFI is unable to detect it? Or are you referencing it not showing up in the Grub menu after installing it on a hard drive?