MultiWii

also check that on the mc the rx is going to tx on gps

No you dont need the i2c board

One of the first problems is to make sure your on the right and same baud rate as the program if you go here to this site its explained good I have the same board and had the same problems and all is working great https://www.youtube.com/watch?v=UJrErUl ... H7&index=3

Yes im using the 2.3 config wiring is right becuase i was flying it before the change to 2.3 the problem before was i couldnt fly more than a foot off the ground..
Will let you know how things work out

here is also a great video waking you through all the steps from updating baud rates to setting it all up .. was having about the same problems and it got me up and running in no time https://www.youtube.com/watch?v=UJrErUl ... H7&index=3
Just another idea

I did the clear eeprom and ecs cal. but now when i start to give it power it flips right over on it back If i hold the qav250 up and about half throtle it rocks back and forth and from side to side .. before i did the clear eeprom and but in the new 2.3 it would fly a foot off the ground great but c...

Crius MultiWii SE V2.5 and i changed Motor maxthrottle #define MAXTHROTTLE 2000 Cal'ed ESC from RX throttle channel and not sure what mw code was on the FC when i bought it
I just set it up when i got it last week.. I did not use the clear_eeprom when i uploaded v2.3

I just bought a Qav 250 with 2208/2400kv after i finished it i was flying ok... Then wanted to add gps and lcd so i updated the firmware to v2.3 now i cant even get it a foot off the ground.. I did cal. esc,s etc In the firmware the this is the maximum value for the ESCs at full power, this value ca...

I was having about the same problem till i watched the video on youtube by painless360 it fixed all my problems even shows how to update gps module etc.. worth a watch and he has some other great videos
https://www.youtube.com/watch?v=UJrErUl ... H7&index=3

Thanks Arakon I have it all working great now right after i did update the firmware and did a reset on transmitter as there where some old settings from my naza setup and arming worked after that..

The problem I'am having is that after installing firmware MultiWii_2_1 to my CRIUS MultiWii SE v2.50 is that i can't get the artificial horizon,pitch,yah mag etc working anymore. The other problem is that i can arm but can't unarm it. Thanks for any help in advance