rotuteros key

Dear All,
I’m accidently upgrade from 3.10 rb411 to 4.16 and now the device says that i dont have any license key, is it possible to downgrade back to 3.30?

thanks

i too tried to upgrade one rb411 boards from 3.3 to 4.16 and it said the license will expire in 30 days. i downgraded to 3.30 and all is ok. did not know what was wrong. the board belongs to a customer.