I need MAJOR Warrior help

[Serum]

The bec jumper is a little bit further under the heatshrink.

Try programming it once without the rx pack, and the 6-12 cells because the onboard BEC is still enabled. (if it works) the rx pack you are using now sucks. You need to get another one, perhaps the problems started with changing the batts?

It would have been a good thing if you removed the BEC jumper with the 18 cells though.