SXX Speedo set up problems

[greenstix7]

HI,
Rerally need some advice,
I'm trying to set up a SXX ESC with a Core R/C 2 stick radio.
I've got through the set up until the last point where you hold the stick back to set the brake and then press SET, the red led lights but the blue one doesn't which means it doesn't complete the set up.
Have followed all the set up steps correctly as follows
http://www.lrp.cc/en/service/tech-tips/tech-tipps-details/?tx_ttnews%5Btt_news%5D=4296&cHash=d62eefdae27e050351903ac15849e935

Is it my radio? What does the AUX switch above the throttle stick do?
This is the radio
http://www.modelsport.co.uk/core-rc-code-2.4ghz-3-channel-fhss-lcd-stick-combo/rc-car-products/38217


Here's hoping someone can help soon!

Thanks

[Lee1972]

Might not be of any use but have you checked if the throttle channel is reversed?