I dunno whether I'm pointing out something completely obvious, but the latest FBI version doesn't return the AM service error anymore, but instead returns a MODULE_NN_OS error. 1.4.12 (MODULE_NN_OS) Error Message Install failed! BigBlueMenu.cia Source: SOURCE_APP_BEGIN_INSTALL (0x5) Module: MODULE_NN_OS (0x6) Level: LEVEL_PERMANENT (0x1b) Summary: SUMMARY_WRONG_ARGUMENT (0x8) Description: <unknown> (0x2f) Press Start to continue. 1.4.9 (AM) Error Message Install failed! Couldn't initialize AM service. Press Start to continue. I know that FBI has recently migrated to citrus, so the code execution order may have been swapped around (NN_OS module may take place before AM (I'll check this, soon)). To conclude my workings out, I'll provide some evidence: This has all been tested out on a 9.9 Sysnand New 3DS.