There is a fix if anyone else installed the "latest" firmware and notices errors.
I contacted Swit and, after asking me where did I find the latest firmware, they sent me a file to downgrade the firmware which is the second file @androidlad had attached in his post
JTH5500_UN108v01.bin
Since the firmware update I have an "error" white screen almost a every time I use the monitor, and I have to reboot it in order to use it again.
Does anyone else have the same problem?