Not sure if there's a video out there, never bothered to hunt for one.
Edit:
BE DAMN WELL SURE YOU'RE IN EMUNAND BEFORE UPDATING. Don't want to update your sysnand after all. **Some people create folders in their sysnand to spell out Sys and Folders to spell out Emu for their emunand. Personally I use different themes.**
All you need to do is
1.Download 3dnus (
https://gbatemp.net/threads/3dnus.376488/)
2.Download 9.5.0-23 (Title ID) EUR (Version) using 3DNUS *Check NEW 3ds*
3.Place update folder 9.5.0-23 onto internal micro sd
3a.Backup your Emunand if you like (
https://gbatemp.net/threads/emunand-tool-release-and-support-thread.359239/)
3.Download & place Dev Menu / Big Blue Menu 3ds format onto gateway red
4.Boot into Emunand & start up Dev / BB Menu
5.Go to the right one to select SDMC tab
6.Open 9.5.0-23 folder
7.Press L + R + A to import all cia
8.Once everything is done, turn off the N3ds & Turn back on booting into your 9.5 emunand
Edit2: Changed Version to EUR. Use USA for N3ds(U) - Eur for Euros - JPN for Japs - ect.