[10] When the dispute was settled in favour of BAE Systems, the vessels were handed over to Royal Brunei Technical Services (RBTS) in June 2007.

As 2018, the MBDA Seawolf missile was out of service due to expired, and there was plan to replace it with VL Mica[12] In late December 2014, KRI Bung Tomo was involved in search and recovery operations of the Indonesia AirAsia Flight 8501 which crashed off the Java Sea between the islands of Belitung and Borneo.

[13] Later in early January 2015, KRI Usman Harun was deployed to search for the black boxes as the ship is equipped with the Thales Underwater Systems TMS 4130C1 hull-mounted sonar.

This upgrade for the KRI Usman Harun is expected to be completed by the end of 2023, and it will considerably extend the service life of the frigate.

Existing weaponry will also be fully integrated, and a new VL MICA surface-to-air missile system added; a significant boost for the vessel's air defence capability.