No space left in device, but there is space left

[Clipo]

Hi all, I was transferring roms from a USB stick to the retropie, and because there were too many files, my disk was full during the transfer. I remove some roms with the filemanager but the problem remains. Now, I can not update because there is a message hat the disk is full all the time, or create tmp file. I tried to resize the partition again, just in case of, but it seems that there are some files from the old transfer still around.

Pi Model or other hardware: RP4 4G
Power Supply used: 5V (I think)
RetroPie Version Used : 4.6
Built From: Premade form the retropie website
USB Devices connected: USB keyboard
Controller used: WIIU Pro controller

[mitu]

Your disk is at 100% capacity - it says so in the screenshot. Some of the disc space on the partition is reserved for the system/root user, so that the system can function even when an user inadvertently fills up the / partition.
Free up some space on your card and to be get back to normal operations.

[Clipo]

Thank you, before, I deleted like 6 GB and it was not enough. I continue deleting like 4 GB more, and then I had 2 GB free, so like 8 GB are part of the system.

[BuZz]

You can lower reserved space. But I would leave some free.

https://ma.ttias.be/change-reserved-blocks-ext3-ext4-filesystem-linux/