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MT12 + ELRS Serious Incident -> Full Throttle Runaway -> Solution

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Alot of that is a completely different language to me but thanks for sharing this.
I opened the github link and don't understand a single line of it. 🤷‍♀️

I keep hearing the MT12 is user friendly, can be figured out...
Then I see posts like this and want to buy an NB4+ instead. 😐
 
Alot of that is a completely different language to me but thanks for sharing this.
Sure! I see it as a serious safety issue and was surprised that:
a) all these flawed receivers are still on the market (I understand it was a business decision and user weren't loud enough)
b) it's not properly documented unless you dig deep and connect the dots
 
I opened the github link and don't understand a single line of it. 🤷‍♀️

I keep hearing the MT12 is user friendly, can be figured out...
Then I see posts like this and want to buy an NB4+ instead. 😐
Hey Mike,
I totally get where you’re coming from! The first time I opened up MT12/EdgeTX stuff, I felt exactly the same and seriously considered just selling it and picking up an NB4+!! It's been in my shopping cart, then I removed it, only to put it back again but then, I decided to go on and figure the EdgeTX stuff out.
It’s true, there’s a short but intimidating learning curve. For me, logical switches weren’t logical at all at first - I spent hours getting something working that probably would have taken 10 minutes on an NB4.

But… once you get over that initial hump, the MT12 with EdgeTX and ELRS is genuinely next-level for surface rigs, especially if you ever want to do long-range, FPV cars, or just like tinkering. Here are some honest pros and cons from someone who’s been through the “why isn’t this working?” pain:

Pros:
• Insane customization: Anything you can imagine - custom telemetry / dashboards, logical switches, special mixes, scripting - custom tools. I don't think there's something you wouldn't be able to program.
• ELRS: Truly outstanding range and link quality, especially for FPV surface vehicles - no more range anxiety - I enjoy sending my cars far away on beaches or exploring fire roads for example. Not that it's needed, it's just nice knowing that this isn't an issue.
• Upgradeable: Community-driven firmware, regular updates.
• Price: For the features, MT12 is very good value (coming from Spektrum, I was honestly blown away at what you get for the money). It's not like you'd ever "outgrow" the MT12.
• Open-source magic: You’re not locked to a single ecosystem, and you can make your own or use other people’s scripts. (If you ever get one, I’ll send you my GitHub with a ready-made custom telemetry script - pretty fun, adds another dimension to it but I admit, I'm still tempted by NB4+ because it'll soon - a month or so they promise - natively utilize new FlySky advanced telemetry!! That's a game changer and unless you'd connect additional sensors to your Radiomaster, you'd never get to that level of interesting/useful live data).
• Future and air/surface-proof: You can run just about anything and almost the same EdgeTX you get on planes, helis, drones.. so that's a huge advantage if you like both surface and air.

Cons:
• Not the most “beginner friendly” out of the box: You’ll spend some time in the manual and on YouTube..
• Overkill for “just bashing”—if you never use telemetry or custom stuff, NB4+ is awesome and easy.
• I have one FlySky TX and it feels great in hand. The MT12 feels huge and I have big hands. It's good but FlySky has figured the ergonomics better I think.

Honestly, if you just want to plug in and go bash in luxury, NB4+ is king for simplicity and it just works! No runaways :-) But if you like to tinker, want long-range ELRS, or want to do wild stuff (like FPV cars with smart telemetry) or enjoy 4-in-1 as your universal TX for many different models, MT12 is hard to beat. If you ever decide to give it a shot, ping me and I’ll share my custom scripts and setup tips to flatten that learning curve!
 
I opened the github link and don't understand a single line of it. 🤷‍♀️

I keep hearing the MT12 is user friendly, can be figured out...
Then I see posts like this and want to buy an NB4+ instead. 😐
I have an MT12. I was just getting tx battery low warnings (battery was very low @ 3.1V per cell), rx signal low, and telemetry loss warnings; but the DB48 kept on shreddin, with full control. I think it is a very good radio, and the basic set up isn't that hard. It's comparable to learning a new radio that you haven't had yet, it's all about the navigation. Not hard at all. The arming triggers, logical switches, yada yada yada, that is a little bit in depth but, there are videos on YT for that. Money well spent and the Radiomaster surface rx's are cheap.
 
Hey Mike,
I totally get where you’re coming from! The first time I opened up MT12/EdgeTX stuff, I felt exactly the same and seriously considered just selling it and picking up an NB4+!! It's been in my shopping cart, then I removed it, only to put it back again but then, I decided to go on and figure the EdgeTX stuff out.
It’s true, there’s a short but intimidating learning curve. For me, logical switches weren’t logical at all at first - I spent hours getting something working that probably would have taken 10 minutes on an NB4.

But… once you get over that initial hump, the MT12 with EdgeTX and ELRS is genuinely next-level for surface rigs, especially if you ever want to do long-range, FPV cars, or just like tinkering. Here are some honest pros and cons from someone who’s been through the “why isn’t this working?” pain:

Pros:
• Insane customization: Anything you can imagine - custom telemetry / dashboards, logical switches, special mixes, scripting - custom tools. I don't think there's something you wouldn't be able to program.
• ELRS: Truly outstanding range and link quality, especially for FPV surface vehicles - no more range anxiety - I enjoy sending my cars far away on beaches or exploring fire roads for example. Not that it's needed, it's just nice knowing that this isn't an issue.
• Upgradeable: Community-driven firmware, regular updates.
• Price: For the features, MT12 is very good value (coming from Spektrum, I was honestly blown away at what you get for the money). It's not like you'd ever "outgrow" the MT12.
• Open-source magic: You’re not locked to a single ecosystem, and you can make your own or use other people’s scripts. (If you ever get one, I’ll send you my GitHub with a ready-made custom telemetry script - pretty fun, adds another dimension to it but I admit, I'm still tempted by NB4+ because it'll soon - a month or so they promise - natively utilize new FlySky advanced telemetry!! That's a game changer and unless you'd connect additional sensors to your Radiomaster, you'd never get to that level of interesting/useful live data).
• Future and air/surface-proof: You can run just about anything and almost the same EdgeTX you get on planes, helis, drones.. so that's a huge advantage if you like both surface and air.

Cons:
• Not the most “beginner friendly” out of the box: You’ll spend some time in the manual and on YouTube..
• Overkill for “just bashing”—if you never use telemetry or custom stuff, NB4+ is awesome and easy.
• I have one FlySky TX and it feels great in hand. The MT12 feels huge and I have big hands. It's good but FlySky has figured the ergonomics better I think.

Honestly, if you just want to plug in and go bash in luxury, NB4+ is king for simplicity and it just works! No runaways :-) But if you like to tinker, want long-range ELRS, or want to do wild stuff (like FPV cars with smart telemetry) or enjoy 4-in-1 as your universal TX for many different models, MT12 is hard to beat. If you ever decide to give it a shot, ping me and I’ll share my custom scripts and setup tips to flatten that learning curve!
I am pretty much in need of a new radio now. I will be racing 1/10 scale. Its been a LONG time since I was racing last.
I have bad internet service here. I would like to avoid buying a product that is reliant on updates or internet.
I'm not a very techy person but I use only FOSS on my phone... I love THAT about the MT12!!!
I LOVE that its NOT Spektrum. They are not my favorite company right now either.
Being able to buy parts to repair and customize switch options is AWESOME!!!
I think its unlikely I will ever get to much other than the progamming to make it function in my rigs.
There are a lot of features that drivers 'need' that my old Futaba Magnum jr never thought of having. Since THAT is what I need, I feel like a LOT of radio features are WAY overkill for me right now.
That said, I also feel like some of the telemetry features avail and more, the channel mixing features would be very useful.
The speed of the elrs system was pretty attractive. Having a better radio to run the bashers also sounds attractive.
bashing isn't the important thing for me so much as a good racing radio.
My hands are BIG. The Spektrum radios I have feel like children's toys in my hands.
I put the large grip on my DX4 and it helped some.
The MT12's size sounds like it won't be an issue.
I won't ever exceed its capabilities either.

The NB4+ fits most of my wants. Right now it will be more than I need too. I think it won't take long to grow into though.

I might go NB4+ way for simplicity and maybe dive into MT12 once I've got some laps in and know better what works and what lacks.
I'm no pro driver. When I don't come in first, its not my gear that will likely be to blame. 🤣

Thanks for offering to help guide me thru the rough peaks! I may very well take you up on the offer!!! 😁
 
I am pretty much in need of a new radio now. I will be racing 1/10 scale. Its been a LONG time since I was racing last.
I have bad internet service here. I would like to avoid buying a product that is reliant on updates or internet.
I'm not a very techy person but I use only FOSS on my phone... I love THAT about the MT12!!!
I LOVE that its NOT Spektrum. They are not my favorite company right now either.
Being able to buy parts to repair and customize switch options is AWESOME!!!
I think its unlikely I will ever get to much other than the progamming to make it function in my rigs.
There are a lot of features that drivers 'need' that my old Futaba Magnum jr never thought of having. Since THAT is what I need, I feel like a LOT of radio features are WAY overkill for me right now.
That said, I also feel like some of the telemetry features avail and more, the channel mixing features would be very useful.
The speed of the elrs system was pretty attractive. Having a better radio to run the bashers also sounds attractive.
bashing isn't the important thing for me so much as a good racing radio.
My hands are BIG. The Spektrum radios I have feel like children's toys in my hands.
I put the large grip on my DX4 and it helped some.
The MT12's size sounds like it won't be an issue.
I won't ever exceed its capabilities either.

The NB4+ fits most of my wants. Right now it will be more than I need too. I think it won't take long to grow into though.

I might go NB4+ way for simplicity and maybe dive into MT12 once I've got some laps in and know better what works and what lacks.
I'm no pro driver. When I don't come in first, its not my gear that will likely be to blame. 🤣

Thanks for offering to help guide me thru the rough peaks! I may very well take you up on the offer!!! 😁
Hey Mike,

Honestly, with your “bear paws” (respect!), the NB4+ is probably the radio equivalent of buying a luxury sedan - roomy and ergonomic.
I agree some radios feel like a Happy Meal toy. Both the MT12 and NB4+ feel like they were designed for actual adults!
Not everything in this world is made for people who can crush soda cans just by looking at them 🤣

And you know what? For what you’re describing: racing, solid feel, dead-simple setup, and not needing a degree in computer science just to start the car - the NB4+ might just be the finest choice out there. It’s genuinely “plug in, set up, drive, have fun.”
Speaking of which, I have just read the documentation for the new ELRS update and it's amazing how well the devs actually work! But it also changes some tiny details about how you can program certain functions - for the better! Simply incredible. I think that for me, part of the fun is being a member of this community, where you can learn something new every day.

I have to admit, though, I love that you’re FOSS-minded and the idea of fixing and customizing appeals to you. If, down the road, you get curious or want to try out the infinite-tinker-verse that is the MT12, just say the word and I promise to keep the logic switches to under three espressos per session :)

But for right now, if you want a radio that just works, the NB4+ is totally worth it.
 
Hey Mike,

Honestly, with your “bear paws” (respect!), the NB4+ is probably the radio equivalent of buying a luxury sedan - roomy and ergonomic.
I agree some radios feel like a Happy Meal toy. Both the MT12 and NB4+ feel like they were designed for actual adults!
Not everything in this world is made for people who can crush soda cans just by looking at them 🤣

And you know what? For what you’re describing: racing, solid feel, dead-simple setup, and not needing a degree in computer science just to start the car - the NB4+ might just be the finest choice out there. It’s genuinely “plug in, set up, drive, have fun.”
Speaking of which, I have just read the documentation for the new ELRS update and it's amazing how well the devs actually work! But it also changes some tiny details about how you can program certain functions - for the better! Simply incredible. I think that for me, part of the fun is being a member of this community, where you can learn something new every day.

I have to admit, though, I love that you’re FOSS-minded and the idea of fixing and customizing appeals to you. If, down the road, you get curious or want to try out the infinite-tinker-verse that is the MT12, just say the word and I promise to keep the logic switches to under three espressos per session :)

But for right now, if you want a radio that just works, the NB4+ is totally worth it.
I decided to watch more vids on both radios. I have come to the same decision. I think the radio right now needs to be NB4+ for simplicity of use. Plug and playness??? 🤣
I do thank you and I think some time down the road, trying the MT12 is very likely still!
The features, FOSS, price... I do want to try it some time. 👍
Your knowledge of this radio and Edge is just amazing!!!
I am going to continue and try to learn as much as I can here. 😎😁
 
I'm considering an MT12 but this thread is making me a little nervous. The unsafe list in post #18 includes the RadioMaster ER4 2.4GHz and ER5A/C. Can I also assume it includes the ER3C-i and ER5C-i since they're also based on the ESP8285? The suggested ARM switch using Channel 5 seemed sensible but the response from the developers has me wondering how much control we have over what shows up on the GPIO pins during RX reboots or other disturbances. Maybe those events aren't long enough to cause a runaway problem and the ARM / DISARM function takes control soon afterward. Or maybe I just Fred Flintstone the whole operation by dusting off my PICmicro programmer and putting an 8-bit shenanigan detector between the RX and throttle servo. Is there any hope RM will upgrade to an MCU / SoC that avoids these issues?
 
I have an MT12 4 in 1 and have had zero issues. On my nitro and fuel powered cars I had runaway and signal loss with the radiolink rx (rf7 something?). It is the only rx they have with telemetry. I still use other radiolink receivers with my radiomaster with no issues. The radiomaster isn't easy to navigate at first but, once you program a few cars on it and use the features a few times you start to get the hang of it. There are numerous videos on it. With enough time on it, these tasks become natural.
It's a great radio but I would never talk anyone out of something else if they were uncertain. I'd hate for a fella to spend money on a radio, and it just doesn't work out for them. I like to try new products and take risks but that is just me. Sometimes those risks do not pay off 🙃 (furitek dominator 150a I'm talking about you).
 
After Wickedfog showed me some of the capabilities of this platform I did a little more research and decided to order the ELRS version. There's too much potential there for me to ignore. I already have a functional radio for all my models so I can take my time and get familiar with this system before using it.
 
That was a firmware bug. And it only showed up with certain combos, and I think folks weren't setting their failsafe correctly. At least that's what they were saying in the EdgeTx discord.

Everything is back to normal now. One thing I do is I wait between firmware updates. I am always running 1 or 2 updates behind or more. Sometimes 4 or 5 behind because EdgeTx releases updates pretty often.

You gotta figure - the MT12 is Radiomaster's first surface radio. All the guys working on the firmware are airplane guys. It's like when the radio first came out they had channel 1 set to the ESC by default when you created a new model. I always thought that's the way it should have been anyway. But you can change that setting in the radio so every new model gets created with proper channel mapping.

That NB4+ is a badass radio too. It has telemetry as well, and is even easier setting up a temp sensor (no soldering), plus it has a color screen.
 
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