Taranis QX7 / ExpressLRS - stuck on loading | Drone Community | Page 1

uncut fox Jul 19, 2025, 11:09 PM

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I am trying to set up my first ELRS on Taranis QX7. I am using BetaFPV Micro TX external module that I want to bing with BetaFPV ELRS Slim RX.
When I'm trying to access TOOLS / ExpressLRS it gets stuck with "loading" on the screen forever. People often say it's because external module might not be turned on in model settings, but unfortunately it's not my case. It's already turned on. However there is a "[XXXX]Err" written next to "Status 250Hz" with XXXX being a number that's increasing with each second. Any thouts on what did I do wrong? I am attaching some pictures of the problem. I am new to FPV and I would be greatful for ANY help guys!

valid widget Jul 20, 2025, 1:55 AM

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ig guess there is some option to be turned on
the external rrf or something like that

uncut fox Jul 20, 2025, 10:52 AM

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Unfortunately the external RF is already turned on as you can see on the image.

coarse phoenix Jul 20, 2025, 2:03 PM

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On the module screen can you turn its expected packet rate down to 50hz?
IIRC the QX7 can only do 50 stock and needs inversion mod to reach 150 even.

So the module being in 250 mode may be the conflict here.
Try it on 50 for now?

I'm not 100% sure anyhow cuz I don't have this radio nor elrs.

uncut fox Jul 21, 2025, 6:13 PM

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No luck with changing the packet rate to 50Hz on the module. However changing this on the module doesn't affect the status on QX7 - it's always fixed on 250Hz.

cinder barn Jul 21, 2025, 6:58 PM

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uncut fox I am trying to set up my first ELRS on Taranis QX7. I am using BetaFPV Micro TX ...

Has the radio been updated to latest EdgeTX?
Since it's a QX7 ACCST, which has a crippled module bay, did you do the hardware mod, or enabled OneBit sampling mode?

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Also, in newer ELRS versions, the module will automatically limit the packet rate to not overwhelm the baud rate.
I think yours may be slightly too old for that.

uncut fox Jul 21, 2025, 7:03 PM

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I am on OpenTX - I've seen people running this setup on OpenTX without any problems. Also I don't have a hardware mod as I've heard it's only necessary to go 400kbaud. The problem is not with the ELRS not working properly but with the LUA script not even loading a configuration page on my QX7.

cinder barn Jul 21, 2025, 7:07 PM

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uncut fox I am on OpenTX - I've seen people running this setup on OpenTX without any probl...

OpenTX is a loooong dead project, and ELRS no longer attempts to officially maintain support for it.
Please upgrade it to EdgeTX. If you don't want to lose your models, make sure to follow the EdgeTX Upgrade guide. Aside from the models thing it's a painless process.

Then, you either need to enable OneBit sampling mode, or do the Hardware mod. For ELRS, 400k is kind of a reasonable minimum. It can be run on 115.2k if you set the packet rate to like 50Hz or so but it's not recommended.

Currently, you're trying to run 400k but your radio is physically and software-wise unable to do so.
OneBit mode was introduced with some late OpenTX version, but at that point just upgrade to EdgeTX and be done with it.

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One of the issues with QX7's is that each one is a bit different. Some can run 400k with just OneBit sampling, others can't.

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Some can't even do 115.2k reliably..

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(ex QX7 owner here)

uncut fox Jul 24, 2025, 7:56 PM

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cinder barn OpenTX is a loooong dead project, and ELRS no longer attempts to officially main...

Man, you're great! I've migrated my QX7 to EdgeTX, installed ExpressLRS lua once again and it works. Thank you!

cinder barn Jul 24, 2025, 7:57 PM

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uncut fox Man, you're great! I've migrated my QX7 to EdgeTX, installed ExpressLRS lua once...

Did you enable OneBit sampling? (may be enabled by default, idk)

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Just wondering how lucky you got with the inverter lottery 😂

uncut fox Jul 24, 2025, 7:58 PM

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To be honest, no idea 😆 It just works hahah

cinder barn Jul 24, 2025, 7:58 PM

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at 400k? 😄

uncut fox Jul 24, 2025, 7:58 PM

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115,2k

cinder barn Jul 24, 2025, 7:58 PM

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ah

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okay, that makes sense

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most of them can do that

uncut fox Jul 24, 2025, 7:59 PM

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now I need help with pairing my ELRS Lite RX with this hahaha

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but that's a different topic

cinder barn Jul 24, 2025, 7:59 PM

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Did you update the firmware of both the TX and RX?

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you can do binding as part of updating the FW (which is always recommended to do)

uncut fox Jul 24, 2025, 7:59 PM

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currently no luck with even powering on the RX

cinder barn Jul 24, 2025, 8:00 PM

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yikes

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wiring?

uncut fox Jul 24, 2025, 8:02 PM

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4v5 on the FC to 5v on the receiver, gnd to rnd, rt to tx, tx to rx

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no LED flashing when powered on

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on both usb and battery plugged in

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looks like the receiver is dead

vital ginkgo Jul 24, 2025, 8:07 PM

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If you have a multimeter, check the voltage across the power/ground wires

cinder barn Jul 24, 2025, 8:08 PM

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would be nice to see actual wiring pics

vital ginkgo Jul 24, 2025, 8:08 PM

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That too

uncut fox Jul 24, 2025, 8:27 PM

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I'll check the voltage tomorrow

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here's wiring

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cinder barn Jul 24, 2025, 8:39 PM

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uncut fox

what's that all over the FC pads? Is that just excess rosin/flux?

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looks a tiny bit sus

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show the other side of the receiver too

uncut fox Jul 25, 2025, 8:19 PM

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cinder barn what's that all over the FC pads? Is that just excess rosin/flux?

yup, just excess flux

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tere is around 4.7v on the powering wires

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so it looks like the receiver is fried

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cinder barn Jul 25, 2025, 8:22 PM

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what does the LED on the receiver do when you power it up?

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solid on or nothing?

uncut fox Jul 25, 2025, 8:23 PM

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nothing at all

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led's on the fc power up

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but the receiver seems to be dead

cinder barn Jul 25, 2025, 8:53 PM

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uncut fox but the receiver seems to be dead

on an ELRS receiver with a non-RGB LED, the LED lights up by default

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ELRS firmware actually has to turn it OFF after booting

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did you measure voltage on the receiver itself?

uncut fox Jul 25, 2025, 9:17 PM

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Yes, measured on both the FC and on the receiver separately

cinder barn Jul 25, 2025, 9:18 PM

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take the heatshrink off the receiver and take pics again

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check for any missing or shorted components

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otherwise, get a new receiver

#Taranis QX7 / ExpressLRS - stuck on loading