diff --git a/libraries/libstratosphere/include/stratosphere/spl/impl/spl_api_impl.hpp b/libraries/libstratosphere/include/stratosphere/spl/impl/spl_api_impl.hpp
index db2354329..1a79d67b1 100644
--- a/libraries/libstratosphere/include/stratosphere/spl/impl/spl_api_impl.hpp
+++ b/libraries/libstratosphere/include/stratosphere/spl/impl/spl_api_impl.hpp
@@ -70,6 +70,7 @@ namespace ams::spl::impl {
     Result ModularExponentiateWithDrmDeviceCertKey(void *out, size_t out_size, const void *base, size_t base_size, const void *mod, size_t mod_size);
     Result PrepareEsArchiveKey(AccessKey *out_access_key, const void *base, size_t base_size, const void *mod, size_t mod_size, const void *label_digest, size_t label_digest_size, u32 generation);
     Result LoadPreparedAesKey(s32 keyslot, const AccessKey &access_key);
+    Result PrepareEsUnknown2Key(AccessKey *out_access_key, const void *base, size_t base_size, const void *mod, size_t mod_size, const void *label_digest, size_t label_digest_size, u32 generation);
 
     /* FS */
     Result DecryptAndStoreGcKey(const void *src, size_t src_size, const AccessKey &access_key, const KeySource &key_source, u32 option);
diff --git a/libraries/libstratosphere/include/stratosphere/spl/impl/spl_es_interface.hpp b/libraries/libstratosphere/include/stratosphere/spl/impl/spl_es_interface.hpp
index 0fda18172..237c3124e 100644
--- a/libraries/libstratosphere/include/stratosphere/spl/impl/spl_es_interface.hpp
+++ b/libraries/libstratosphere/include/stratosphere/spl/impl/spl_es_interface.hpp
@@ -28,6 +28,7 @@
     AMS_SF_METHOD_INFO(C, H, 28, Result, DecryptAndStoreDrmDeviceCertKey,         (const sf::InPointerBuffer &src, spl::AccessKey access_key, spl::KeySource key_source),                                                                             (src, access_key, key_source),                         hos::Version_5_0_0)                     \
     AMS_SF_METHOD_INFO(C, H, 29, Result, ModularExponentiateWithDrmDeviceCertKey, (const sf::OutPointerBuffer &out, const sf::InPointerBuffer &base, const sf::InPointerBuffer &mod),                                                                 (out, base, mod),                                      hos::Version_5_0_0)                     \
     AMS_SF_METHOD_INFO(C, H, 31, Result, PrepareEsArchiveKey,                     (sf::Out<spl::AccessKey> out_access_key, const sf::InPointerBuffer &base, const sf::InPointerBuffer &mod, const sf::InPointerBuffer &label_digest, u32 generation), (out_access_key, base, mod, label_digest, generation), hos::Version_6_0_0)                     \
-    AMS_SF_METHOD_INFO(C, H, 32, Result, LoadPreparedAesKey,                      (s32 keyslot, spl::AccessKey access_key),                                                                                                                           (keyslot, access_key),                                 hos::Version_6_0_0)
+    AMS_SF_METHOD_INFO(C, H, 32, Result, LoadPreparedAesKey,                      (s32 keyslot, spl::AccessKey access_key),                                                                                                                           (keyslot, access_key),                                 hos::Version_6_0_0)                     \
+    AMS_SF_METHOD_INFO(C, H, 33, Result, PrepareEsUnknown2Key,                    (sf::Out<spl::AccessKey> out_access_key, const sf::InPointerBuffer &base, const sf::InPointerBuffer &mod, const sf::InPointerBuffer &label_digest, u32 generation), (out_access_key, base, mod, label_digest, generation), hos::Version_18_0_0)
 
 AMS_SF_DEFINE_INTERFACE_WITH_BASE(ams::spl::impl, IEsInterface, ::ams::spl::impl::IDeviceUniqueDataInterface, AMS_SPL_I_ES_INTERFACE_INTERFACE_INFO, 0x346D5001)
diff --git a/libraries/libstratosphere/source/spl/impl/spl_api_impl.cpp b/libraries/libstratosphere/source/spl/impl/spl_api_impl.cpp
index acec07407..c5c450b1b 100644
--- a/libraries/libstratosphere/source/spl/impl/spl_api_impl.cpp
+++ b/libraries/libstratosphere/source/spl/impl/spl_api_impl.cpp
@@ -893,6 +893,10 @@ namespace ams::spl::impl {
         R_RETURN(PrepareEsDeviceUniqueKey(out_access_key, base, base_size, mod, mod_size, label_digest, label_digest_size, smc::EsDeviceUniqueKeyType::ArchiveKey, generation));
     }
 
+    Result PrepareEsUnknown2Key(AccessKey *out_access_key, const void *base, size_t base_size, const void *mod, size_t mod_size, const void *label_digest, size_t label_digest_size, u32 generation) {
+        R_RETURN(PrepareEsDeviceUniqueKey(out_access_key, base, base_size, mod, mod_size, label_digest, label_digest_size, smc::EsDeviceUniqueKeyType::Unknown2, generation));
+    }
+
     /* FS */
     Result DecryptAndStoreGcKey(const void *src, size_t src_size, const AccessKey &access_key, const KeySource &key_source, u32 option) {
         R_RETURN(DecryptAndStoreDeviceUniqueKey(src, src_size, access_key, key_source, option));
diff --git a/stratosphere/spl/source/spl_es_service.hpp b/stratosphere/spl/source/spl_es_service.hpp
index a4cba97f6..57943ec24 100644
--- a/stratosphere/spl/source/spl_es_service.hpp
+++ b/stratosphere/spl/source/spl_es_service.hpp
@@ -55,6 +55,10 @@ namespace ams::spl {
             Result LoadPreparedAesKey(s32 keyslot, AccessKey access_key) {
                 R_RETURN(m_manager.LoadPreparedAesKey(keyslot, this, access_key));
             }
+
+            Result PrepareEsUnknown2Key(sf::Out<AccessKey> out_access_key, const sf::InPointerBuffer &base, const sf::InPointerBuffer &mod, const sf::InPointerBuffer &label_digest, u32 generation) {
+                R_RETURN(m_manager.PrepareEsUnknown2Key(out_access_key.GetPointer(), base.GetPointer(), base.GetSize(), mod.GetPointer(), mod.GetSize(), label_digest.GetPointer(), label_digest.GetSize(), generation));
+            }
     };
     static_assert(spl::impl::IsIEsInterface<EsService>);
 
diff --git a/stratosphere/spl/source/spl_secure_monitor_manager.cpp b/stratosphere/spl/source/spl_secure_monitor_manager.cpp
index e5b899169..c31bae8bf 100644
--- a/stratosphere/spl/source/spl_secure_monitor_manager.cpp
+++ b/stratosphere/spl/source/spl_secure_monitor_manager.cpp
@@ -121,6 +121,10 @@ namespace ams::spl {
         R_RETURN(impl::PrepareEsArchiveKey(out_access_key, base, base_size, mod, mod_size, label_digest, label_digest_size, generation));
     }
 
+    Result SecureMonitorManager::PrepareEsUnknown2Key(AccessKey *out_access_key, const void *base, size_t base_size, const void *mod, size_t mod_size, const void *label_digest, size_t label_digest_size, u32 generation) {
+        R_RETURN(impl::PrepareEsUnknown2Key(out_access_key, base, base_size, mod, mod_size, label_digest, label_digest_size, generation));
+    }
+
     Result SecureMonitorManager::PrepareCommonEsTitleKey(AccessKey *out_access_key, const KeySource &key_source, u32 generation) {
         R_RETURN(impl::PrepareCommonEsTitleKey(out_access_key, key_source, generation));
     }
diff --git a/stratosphere/spl/source/spl_secure_monitor_manager.hpp b/stratosphere/spl/source/spl_secure_monitor_manager.hpp
index f54ff5da0..c01311ef3 100644
--- a/stratosphere/spl/source/spl_secure_monitor_manager.hpp
+++ b/stratosphere/spl/source/spl_secure_monitor_manager.hpp
@@ -52,6 +52,7 @@ namespace ams::spl {
             Result LoadEsDeviceKey(const void *src, size_t src_size, const AccessKey &access_key, const KeySource &key_source, u32 option);
             Result PrepareEsTitleKey(AccessKey *out_access_key, const void *base, size_t base_size, const void *mod, size_t mod_size, const void *label_digest, size_t label_digest_size, u32 generation);
             Result PrepareEsArchiveKey(AccessKey *out_access_key, const void *base, size_t base_size, const void *mod, size_t mod_size, const void *label_digest, size_t label_digest_size, u32 generation);
+            Result PrepareEsUnknown2Key(AccessKey *out_access_key, const void *base, size_t base_size, const void *mod, size_t mod_size, const void *label_digest, size_t label_digest_size, u32 generation);
             Result PrepareCommonEsTitleKey(AccessKey *out_access_key, const KeySource &key_source, u32 generation);
             Result LoadPreparedAesKey(s32 keyslot, const void *owner, const AccessKey &access_key);
             Result AllocateAesKeySlot(s32 *out_keyslot, const void *owner);