I suggest you use version 2.8 in cia format, because the version of Homebrew Laucher presents several errors of compatibility with the current firmware. If your 3DS is not unlocked, perform the procedures to use the unlock, because chmm2 is giving you several problems in locked 3DS in the current version that use Soundhax.
Chmm2 has been discontinued, so we are no longer having support for the errors that are being presented in 3DS that have a lock, chmm2 will be able to work more easily only if the 3DS is unlocked.