Updating, Deleting, and Adding Permissions

After running your query you will have a table describing access for all objects/fields where at least one profile or permission set has some kind of access. This is an important concept to understand. If no Profiles or Permission Sets have access to an Object or Field, there will not be a record for that object/field.
Updating Permissions
For existing ObjectPermissions/FieldPermissions records, you can make updates to the TRUE and FALSE values in each column, then use Data Loader to upload the changes using the Update feature.
Removing Permissions
To remove all access to an Object/Field, you will need to use the Delete feature in Data Loader to delete the appropriate ObjectPermissions/FieldPermissions records, using a list of Ids.
Adding Permissions
To add access where there is none, you will need to use the Insert feature in Data Loader to create new ObjectPermissions/FieldPermissions records.
Necessary Fields
ObjectPermissions
To data load ObjectPermissions records, include the following fields:
sObjectType
ParentId
PermissionsCreate
PermissionsDelete
PermissionsEdit
PermissionsRead
PermissionsViewAllRecords
PermissionsModifyAllRecords
FieldPermissions
To data load FieldPermissions records, include the following fields:
sObjectType
Field
ParentId
PermissionsEdit
PermissionsRead