Like the title says, I'm stuck on the rainbow screen and I don't know how to fix it.

$ ls -lha ./boot
total 346M
drwxr-xr-x 6 root root 4,0K 1 jan 1970 .
drwxr-xr-x 1 root root 112 5 apr 15:25 ..
-rwxr-xr-x 1 root root 334 24 feb 14:14 boot.cmd
-rwxr-xr-x 1 root root 52K 31 mrt 21:34 bootcode.bin
drwxr-xr-x 2 root root 4,0K 5 apr 16:03 broadcom
-rwxr-xr-x 1 root root 128 4 apr 10:45 cmdline.txt
-rwxr-xr-x 1 root root 84 15 feb 12:25 cmdline.txt.rpi4
-rwxr-xr-x 1 root root 131 24 feb 13:54 config.txt
-rwxr-xr-x 1 root root 1,5K 15 feb 12:25 config.txt.rpi4
drwxr-xr-x 18 root root 4,0K 7 dec 18:48 dtbs
drwxr-xr-x 18 root root 4,0K 4 apr 00:08 dtbs-lts
-rwxr-xr-x 1 root root 3,2K 31 mrt 21:34 fixup4cd.dat
-rwxr-xr-x 1 root root 5,4K 31 mrt 21:34 fixup4.dat
-rwxr-xr-x 1 root root 8,3K 31 mrt 21:34 fixup4db.dat
-rwxr-xr-x 1 root root 8,3K 31 mrt 21:34 fixup4x.dat
-rwxr-xr-x 1 root root 3,2K 31 mrt 21:34 fixup_cd.dat
-rwxr-xr-x 1 root root 7,2K 31 mrt 21:34 fixup.dat
-rwxr-xr-x 1 root root 11K 31 mrt 21:34 fixup_db.dat
-rwxr-xr-x 1 root root 11K 31 mrt 21:34 fixup_x.dat
-rwxr-xr-x 1 root root 39M 15 feb 12:45 Image
-rwxr-xr-x 1 root root 15M 15 feb 12:45 Image.gz
-rwxr-xr-x 1 root root 87M 5 apr 15:43 initramfs-linux-fallback.img
-rwxr-xr-x 1 root root 7,5M 5 apr 15:35 initramfs-linux.img
-rwxr-xr-x 1 root root 87M 5 apr 15:34 initramfs-linux-lts-fallback.img
-rwxr-xr-x 1 root root 7,7M 5 apr 15:27 initramfs-linux-lts.img
-rwxr-xr-x 1 root root 6,9M 5 apr 16:04 initramfs-linux-rpi4.img
-rwxr-xr-x 1 root root 39M 15 feb 16:14 ltsImage
-rwxr-xr-x 1 root root 15M 15 feb 16:14 ltsImage.gz
drwxr-xr-x 2 root root 32K 5 apr 16:03 overlays
-rwxr-xr-x 1 root root 25M 15 feb 12:25 rpi4Image
-rwxr-xr-x 1 root root 796K 31 mrt 21:34 start4cd.elf
-rwxr-xr-x 1 root root 3,6M 31 mrt 21:34 start4db.elf
-rwxr-xr-x 1 root root 2,2M 31 mrt 21:34 start4.elf
-rwxr-xr-x 1 root root 2,9M 31 mrt 21:34 start4x.elf
-rwxr-xr-x 1 root root 796K 31 mrt 21:34 start_cd.elf
-rwxr-xr-x 1 root root 4,7M 31 mrt 21:34 start_db.elf
-rwxr-xr-x 1 root root 2,9M 31 mrt 21:34 start.elf
-rwxr-xr-x 1 root root 3,6M 31 mrt 21:34 start_x.elf