Pc does not let you remove files from the flash drive

[maycne.sonahoz]

@Filipi565

sdb iso9660 Joliet Extension MANJARO_KDE_2126 2022-04-16-05-50-10-00
├─sdb1 iso9660 Joliet Extension MANJARO_KDE_2126 2022-04-16-05-50-10-00 0 100% /run/media/filipi_goncalves/MANJARO_KDE_2126
└─sdb2 vfat FAT12 MISO_EFI 208C-5689 4M 0% /run/media/filipi_goncalves/MISO_EFI

Well, that makes sense: your USB stick is currently a Manjaro liveUSB, and those aren’t writable by default.

As repeatedly explained, there is no need trying to remove the files from a partition you want reformat.
Since you want to burn an ISO into that USB, you can use a tool dedicated for that kind of task: USB flash installation medium - ArchWiki
PS: imagewriter and popsicle are also available in the repositories.

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