How to Update Record in Custom metadata type through Salesforce Apex Class?

Hello Piyush,

You can’t update protected types and records in custom metadata programmatically. You can modify protected types and records only by performing a package upgrade.

You can’t update public types and records by using Apex directly. To modify records from Apex, you must make calls to the Metadata API.

Yes you can:

• https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_class_Metadata_CustomMetadata.htm
• https://salesforce.stackexchange.com/questions/192018/how-do-i-update-a-namespaced-custom-metadata-type-record-after-making-a-package