Honor 6 missing OTA upgrade to android 6

I recently bought an Honor 6 (specifically the H60-L04 model) which I took from android 4.4 to 5.1 (firmware H60-L04C900B521) using the updater app, all went smoothly. However, searching around, It would seem that android 6 update has been released in May as a downloadable firmware, and OTA update should have been out by June; yet, if I open the updater app, it says that my phone is already at last version. So my question is threefold: 1. Is this because the OTA update isn't out yet, or because my phone is not compatible? 2. Is it safe to upgrade using the downloadable firmware? The procedure seems easy enough 3. Will such an upgrade reset my phone, or will it keep the data?