I will answer my question about WhatsApp.
"WhatsApp does not support phones with custom firmware. There are too many configurations of such systems that may conflict with the work of WhatsApp. In addition, the flashed devices do not allow the WhatsApp security system to function properly. If you use a phone with custom firmware, other apps can access your messages despite end-to-end encryption. To make WhatsApp work in the best way, use the official firmware and get rid of the custom one. Contact your phone manufacturer for detailed instructions on how to remove the custom firmware."
The question remains, why does "EU" get this way on firmware, have I tried it on others, for example, "EliteRom" this does not happen?
How can I fix this so that WhatsApp doesn't see that the "EU" firmware is not custom?