https://github.com/SilicaAndPina
http://www.mediafire.com/file/5dsi28ugbouq3by/FWReinstaller.vpk
that will reinstall firmware 3.60 ............ install from vita shell ................... henkaku enso has the option to reinstall firmware 3.60 also (perform the remove feature page mod, henkaku enso checks for that, for some reason, then it will reinstall 3.60 when you try to install henkaku enso from the .vpk).
Remove Feature Page Mod
Once VitaRW is installed, run it and then return to vitashell.
Navigate to vs0:/app/ and delete the "NPXS10102" folder
restart the vita and the feature page is removed
now run henkaku enso and reinstall enso, it will reinstall 3.60 firmware, say, yes at the prompt, doesn't matter of it is already installed it should still give you the prompt, i think
(factory restore an delete all internal memory, then install henkaku.xyz/go/, install henkaku, then perform the remove feature page mod, then restarted, install henkaku from webpage, then remove feature page, and then install henkaku enso and you will reinstall 3.60 firmware, it will detect that the feature page is removed)