If you are updating to 5238 specifically to use a Josi/Joying adapter, it is a solid choice. Ensure you select the correct variant (usually West for Europe/USA or East for Asia/Russia) during the update process to avoid navigation database errors.
for your vehicle's revision to check your current hardware version? firmware upgrade | Notes from a Nerd - WordPress.com 1 Oct 2015 — rns 510 firmware 5238 josi work