  Results of a detailed examination of the cascade nucleosynthesis resulting
from the putative hadronic decay, evaporation, or annihilation of a primordial
relic during the Big Bang nucleosynthesis (BBN) era are presented. It is found
that injection of energetic nucleons around cosmic time 1000 sec may lead to an
observationally favored reduction of the primordial Li7/H yield by a factor 2 -
3. Moreover, such sources also generically predict the production of the Li6
isotope with magnitude close to the as yet unexplained high Li6 abundances in
low-metallicity stars. The simplest of these models operate at fractional
contribution to the baryon density Omega_b h^2> 0.025, slightly larger than
that inferred from standard BBN. Though further study is required, such
sources, as for example due to the decay of the next-to-lightest supersymmetric
particle into GeV gravitinos or the decay of an unstable gravitino in the TeV
range of abundance \Omega_G h^2\sim 5\times 10^{-4} show promise to explain
both the Li6 and Li7 abundances in low metallicity stars.
