(something) is downgraded to (something)
For something to be "downgraded" means that someone has changed it from a higher level to a lower level. You use this when you're talking about the level or classification of something. For exmple:
Their credit rating has been downgraded.
Are you able to downgrade your account to a lower level?
Use "from" with "downgrade" to expres the original level and "to" for the new lower level.
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