Hello Jabi, check that you have not inserted video files for static beacon that if large, do not leave room for the patch.
You can delete everything from the patch itself or if you prefer to SSH with Putty and give this command:
# rm -f /mnt/jffs2/*
Then try to load the ptch again.
Check the name it writes to you after you select the file.
If the file differs from patch.zip all lowercase is not accepted