# Has the nested\_nlsolve\_kwargs keyword been removed from the SciML FIRK BVP solvers?

**URL:** <https://discourse.julialang.org/t/has-the-nested-nlsolve-kwargs-keyword-been-removed-from-the-sciml-firk-bvp-solvers/135934>\
**Category:** Numerics\
**Tags:** question\
**Created:** [March 1, 2026, 6:08am UTC](https://discourse.julialang.org/t/has-the-nested-nlsolve-kwargs-keyword-been-removed-from-the-sciml-firk-bvp-solvers/135934 "2026-03-01T06:08:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ThermionicsGuy](https://avatars.discourse-cdn.com/v4/letter/t/c37758/32.png) [@ThermionicsGuy](https://discourse.julialang.org/u/ThermionicsGuy)\
**Post date:** [March 1, 2026, 6:08am UTC](https://discourse.julialang.org/t/has-the-nested-nlsolve-kwargs-keyword-been-removed-from-the-sciml-firk-bvp-solvers/135934/1 "2026-03-01T06:08:38Z")

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I want to control the tolerances and choice of nonlinear solution algorithm in the nested solver for the RaduaIIa5 boundary value problem solver. The documentation I can find says to use the nested\_nlsolve\_kwargs keyword. When I try that the compiler tells me that no such keyword exists. Has it been removed in the most recent version? If so, what replaced it?

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [March 1, 2026, 2:13pm UTC](https://discourse.julialang.org/t/has-the-nested-nlsolve-kwargs-keyword-been-removed-from-the-sciml-firk-bvp-solvers/135934/2 "2026-03-01T14:13:33Z")

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Open an issue. It’s in the docs but not the docstring because the kwargs go into solve. That’s a bit wonky.

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**Author:** ![Oscar\_Smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/oscar_smith/32/25343_2.png) [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)\
**Post date:** [March 1, 2026, 5:33pm UTC](https://discourse.julialang.org/t/has-the-nested-nlsolve-kwargs-keyword-been-removed-from-the-sciml-firk-bvp-solvers/135934/3 "2026-03-01T17:33:26Z")

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That kwarg really should go into the algorithm.

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [March 1, 2026, 5:41pm UTC](https://discourse.julialang.org/t/has-the-nested-nlsolve-kwargs-keyword-been-removed-from-the-sciml-firk-bvp-solvers/135934/4 "2026-03-01T17:41:44Z")

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It should