r/Radiomaster

The Problem: Flipping the SA switch on the RadioMaster Boxer does not arm the drone regardless of power source (USB on betaflight alongside with battery or battery alone). Despite AUX1 being correctly assigned to SA on CH5, and the ARM mode being correctly set to AUX1 range 1700-2100 in Betaflight, the drone does not respond to the SA switch. While the Betaflight log once showed "Arming Enabled" when SA was flipped during a USB+battery session, the drone itself never actually armed — motors never responded.

What I know for certain:

• SA physically works
• Crossfire link is solid green on both ends (on the receiver and on the TBS module on the controller)
• Betaflight configuration is correct
• Arming appeared in log once but motors never actually responded
• SB and SC surely works for AUX2 and AUX3, but SA never worked for a AUX1

With the information above, what might be the cause of this problem??
I have been trying to deal with these ONE problem for over 10 hours now, not only searching online, but also attempting to ask Claude and Gemini, but nothing seems to have any help.

Assets:
Betafpv Pavo 35 (TBS), with FC firmware - BETAFPVF722
Radiomaster Boxer, along with an external TBS module for the TBS receiver on the pavo35
DJI N3 & DJI O4 Pro air unit

Hello everyone,

I ordered a RadioMaster TX15 Max yesterday, and foolishly I didn’t think to order my batteries.
And I thought I had some 18650 e-cigarette batteries.

- The black ones are 18650 3500mAh 20A 3.7V
- The white ones are 18650 3000mAh 20A 3.7V

Do you think I can use them with the remote, or should I order different ones?
I don’t think there’s a difference, but just to be safe, I’d rather ask than make a mistake.

Second question: Do you think the MPV FC2 chargers are worth keeping if I buy other batteries, or are the smart models better?

Thanks

Hi! Since the default screens on EdgeTX are pretty confusing and hard to understand, I created this screen that’s more in line with traditional RC car controllers. Feedback and suggestions are welcome!

https://github.com/CuriousDolphin/radiomaster-mt12-edgetx-race-display

Got my brand new radio, and the counter says 01d11:26. so does it mean it isnt new?