I can think of a couple of possibilities, first you may be taking too long to connect the battery to the models, It must be done during the first few seconds, some have even connected the battery first then switched on the Tx, its not recommended but works, do not touch the sticks binding the binding process.
Second its either a damaged or wrong Rx, there are two different Rx's one for Devo one for 2801 pro, you could have the wrong one.
Regards David
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