My eRX Rear Derailleur stops working during ride. Anybody have a fix?

One hour into ride, rear derailleur “crashed” in gear 12. Derailleur would not come out of 12th gear. There was noise coming from the derailleur, but no movement. Front derailleur kept working.
When I plugged the charger onto the derailleur, nothing changed. It will not come out of 12th gear so I can't recalibrate via the App. Front derailleur still working.

Is there something I can do? Do I need a new rear derailleur?

Thank you for your help!

Did you work this out?

hi.How did he perform on the climbs, I'm curious about his reactions?

Did it give you a hard frame feeling?

Not at all. It was actually really good, no frame flex at all but not a harsh ride. I was running 28mm tyres at 80psi.

I've just spent 6 days riding out to watch each stage of the Tour Down Under with my full AliExpress build, including er9 12 speed set up. 600km and 7000m of climbing and it didn't miss a beat. Still no rides in the wet but given other reported issues I added silicone around where the cables plug in to enhance the waterproofing.

First ride today.  First impressions are positive.

The frame is stiff but with 28mm tyres it rides really well, much better than I anticipated coming from an Orbea Orca aero. I haven't had any seat post slippage and no other issues whatsoever but I only did 20km.  My main concern is the crappy head tube spacers and the head tube remaining tight given they are only plastic so we will see how that goes after some decent mileage.

I'm built up with LTwoo electronic 12 speed. Shifting was good and braking performance seems good too.

Looking forward to seeing how it goes on longer rides.

How much play?

Same set of headset parts here

Looks to be the standard parts that it comes with. Mine were all the same as yours.

I cannot for the life of me get the RD cable through the chainstay. A cable housing is no problem. But the electronic cable plug is rather long and stiff and it seems there’s a bend in the cable entry port at the rear drop out that I just can’t get the plug to pass. What’s more is that my internal cabling tool is useless for this bc you can’t connect it to the electronic cable in any way. So I keep taping it to shift cable housing and try to pull it through from both ends. But no success. It tears off every time.

Any tips?

Can you show it via photo?

Well, it seems I have now done 850km with the frame so maybe a little more feedback...
I am fairly happy with the frame now.

• Stability of the steering is a lot better with the grips less inward angled.
• Play in the rear derailleur stays away after the modification of the hanger parts
• There is some creaking that keeps popping up, especially after hitting a hole in the road or doing a little bunny hop. I suspect it is the left BB cup as there is always some anti-seize compound where the cup threads into the frame that even re-appears after a while even after washing it off. I reckon this can only mean there is some movement there. I am going to remove the cup, clean it and put some mild thread locker on the threads. 
• Seatpost seems to stay put for the time being with he 6 Nm torque, thread locker on the bolt and a lot of carbon paste.

Great to hear your updates. I've almost finished my build (have been progressing slowly as have been in sling following shoulder surgery). Hopefully I'll get a test run over the next few weeks but won't really start riding it until December I'd say.