Hi…,
Welcome.
Check you have Created and Generated a SimBrief flight plan using the PMDG 777-200ER profiles rather than default.
Make sure you have the release PMDG 777-200ER v 2.00.099, installed and running.
In the EFB General Preferences make sure you have your SimBrief Alias entered.
At EFB home (Flight Details), press Request New Data from SimBrief which will load the flight plan you generated.
In the FMC RTE page, choose Route Request. On ROUTE FILES page, you should see your green SIMBRIEF RTE . Select it and on next page SET PAYLOAD, SET FUEL, and SELECT RTE.
After about 15 secs, in RTE1 page press LOAD ROUTE. After UPLINK LOADING , press ACTIVATE and EXEC.
Cheers
Ian