In this short post I gathered all the links with the different versions of firmwares tested by me for RKM MK902 TV Box (CPU:RK3188 Quad Core, WiFi chip: AP6210).
1. Original stock firmware (first release) (official firmware, Android Jelly Bean 4.2.2, rooted)
2. 1080p 140114 stock firmware (official firmware, Android Jelly Bean 4.2.2, rooted)
3. New 140308 stock firmware (official firmware, Android Jelly Bean 4.2.2, rooted)
4. CloudnetGo CR11S 14032014 firmware (non-official firmware, Android Jelly Bean 4.2.2, not rooted)
5. Neomode firmware version 1.0 (custom firmware, Android Jelly Bean 4.2.2, rooted)
6. Smic717394 1080 v1.5 Custom ROM (custom firmware, Android Jelly Bean 4.2.2, rooted)
7. Android KitKat 4.4.2 (non-official firmware, Android KitKat 4.4.2, not rooted)
8. Cloudnet CR11S 4.4.2 20140411 firmware (non-official firmware, Android KitKat 4.4.2, not rooted)
9. SMIC717394 KitKat 4.4.2 Custom Rom V2 (custom firmware, Android KitKat 4.4.2, rooted)
10. Cloudnet CR11S 4.4.2 20140506 5MP firmware (non-official firmware, Android KitKat 4.4.2, rooted)
11. Quickshot v3 by THe NiTRo TeaM KitKat firmware (custom firmware, Android KitKat 4.4.2, rooted)
12. Official Android 4.4 KitKat firmware (official firmware, Android KitKat 4.4.2)
13. Android 4.4.2 KitKat custom root firmware by Kasty (custom firmware, Android KitKat 4.4.2, rooted)
14. MK902 1080p V4.4 firmware Smic717394 new V2 (custom firmware, Android KitKat 4.4.2, rooted) - my favourite one
6. Smic717394 1080 v1.5 Custom ROM (custom firmware, Android Jelly Bean 4.2.2, rooted)
7. Android KitKat 4.4.2 (non-official firmware, Android KitKat 4.4.2, not rooted)
8. Cloudnet CR11S 4.4.2 20140411 firmware (non-official firmware, Android KitKat 4.4.2, not rooted)
9. SMIC717394 KitKat 4.4.2 Custom Rom V2 (custom firmware, Android KitKat 4.4.2, rooted)
10. Cloudnet CR11S 4.4.2 20140506 5MP firmware (non-official firmware, Android KitKat 4.4.2, rooted)
11. Quickshot v3 by THe NiTRo TeaM KitKat firmware (custom firmware, Android KitKat 4.4.2, rooted)
12. Official Android 4.4 KitKat firmware (official firmware, Android KitKat 4.4.2)
13. Android 4.4.2 KitKat custom root firmware by Kasty (custom firmware, Android KitKat 4.4.2, rooted)
14. MK902 1080p V4.4 firmware Smic717394 new V2 (custom firmware, Android KitKat 4.4.2, rooted) - my favourite one