The following year the elder son of Tridu Songtsen, Lha Balpo (Lha Bal-pho) apparently contested the succession of his one-year-old brother, but was "deposed from the throne" at Pong Lag-rang.
Det følgende år bestred den ældste søn af Tridu Songtsen, Lha Balpo (Lha Bal-pho) tilsyneladende sin enårige broders arv, men blev "afsat fra tronen" ved Pong Lag-rang.