There is a problem with the firmware R8BF003 on K790/K800.
You must use Main R8BF003 CID 52 and FS R8BF003 CID 53
This is the process with setool2lite:
1. Flash Main CID 52 and apply quick access patch.
2. Flash FS CID 53 checking the use quick access patch.
3. Flash your CDA separately without checking the quick access patch.