Rikomagic offered several stock firmwares last year (2013) with Android 4.1 and 4.2

Testing a MK802IIIS with Bluetooth i found the following

- the original 4.1 stock firmware corrupted itselft after a while (making the android stick freeze at bootup)

- all 4.2 stock firmwares of rikomagic.de, .co.uk and .com have tremendous glitches in graphics which sometimes render Play Store or Home Screen unusable

- all 4.1 stock firmwares of rikomagic.de, .co.uk and .com were more stable than the original rom but pretty slow

- EXCEPT FOR THE MK802IIIS8B_20130428 BASED ON ANDROID 4.1 WHICH I PREFER OVER THE OTHERS; it's stable (crashes rarely), fast (responsive UI and sleak browsing) and doesn't heat up the device as much when on video playback

just my 2 cents

for updating see rikomagic manual (word file officially available online)