Look on team flying circus there is a blog on spektrum radios how tx have failed I've also seen how a DX8 was updated
by spectrum and failed like the tx had its brain scrambled
I have 2 spectrum systems and I have not had any problems with them yet nock on wood
But I have seen a DX18 fail luckly the plane was on the ground when it happened
futaba also has glitch's I lost a nice war bird to a 14sg the rx would only recive short range signals I had to send the tx an rx in 2 times 1 to replace the rx the second to up grade the tx and rx
so you decide what radio is the best I personally would not even attempt to update any of my spektrum tx radios
let spektrum do it I would gladly pay the postage to get my system 's up graded